HVAC Questions & Answers

It depends on your home envelope, ductwork, electrical capacity, and utility rates. Both are excellent choices when properly designed. We can review the factors that affect operating cost for your home, including equipment efficiency, utility rates, the calculated load and how the system will be used.

A mini split delivers heating and cooling directly to a room without ductwork. It can be a practical option for additions, converted garages, ADUs, bonus rooms and homes where adding conventional ducts is impractical.

An indoor unit serves the zone it is selected and sized for; depending on the layout, that zone may be one room or an open group of spaces. Multi-zone systems can run several indoor units from a single outdoor unit; we size each zone individually so no room is over- or under-served.

Sound levels vary by model and operating speed. Many modern variable-speed heat pumps are designed for low-sound operation, and published sound ratings for the specific equipment are the reliable comparison.

It moves heat from the surrounding air into your water tank instead of burning fuel or relying only on resistance elements, which generally uses less energy than a standard electric water heater. Incentive programs change often, so we confirm what currently applies to your address.

There is no universal number. Rusty water, popping sounds, moisture around the base, or running out of hot water sooner than it used to are all reasons to have the water heater evaluated.

Garages and utility spaces are common locations when they meet the selected manufacturer's requirements for air volume, clearances, temperature range and condensate drainage. We confirm clearances, electrical capacity, and drainage during the site survey.

Manual J is a standardized method for estimating a home's design heating and cooling load using inputs such as construction, windows, insulation, orientation and local design conditions. It is more reliable for equipment sizing than selecting capacity from square footage alone.

We capture accurate room dimensions and duct layout so the design is based on measured reality rather than estimates. Those measurements give the design more accurate inputs for room dimensions and duct layout instead of relying on rough estimates.

It depends on the scope. A straightforward changeout is a much shorter project than one involving duct modifications, electrical work or a multi-zone mini-split system, so we give you the expected duration in the written proposal for your project.

Permit and inspection requirements depend on the scope of the work and the local jurisdiction. We confirm who pulls the permit and what inspections apply in the written proposal for your project.

Not always. We test your existing ducts for leakage and capacity. If they can support the new equipment, we seal and reuse them; if they are the bottleneck, we tell you before you buy.

Warranty coverage varies by manufacturer, product and installation. Registration, maintenance and other requirements may apply, so review the written warranty for the specific equipment. Air Care also provides workmanship coverage on our installations; the applicable terms are stated with the project documentation.

Care Club is a maintenance membership with three plans. Every plan includes scheduled maintenance visits, a repair warranty and a repair discount; Silver and Gold add benefits such as priority status, no overtime charges, preseason scheduling and a loyalty credit. The exact benefits depend on the plan you choose.

Yes. You can list every system in your home during enrollment and we will confirm the coverage and pricing for additional systems before you enroll.

Maintenance can support efficient operation and give a technician opportunities to identify developing issues, but it cannot prevent every failure. The appropriate cadence depends on the equipment, usage, environment and manufacturer guidance. If warranty coverage is a concern, review the specific written warranty for maintenance requirements.

Yes. We offer financing for new installations, upgrades, and larger repairs, with several term options so you can match the monthly payment to your budget.

Incentive programs change frequently — for example, the former federal 25C tax credit is not available for equipment placed in service after December 31, 2025 under current law. California and utility rebates, manufacturer promotions, and financing may still apply. Our Rebates & Incentives page links to the live Rewiring America calculator so you can see what currently applies to your address.

No. Home comfort design consultations for system replacement are provided at no cost. Diagnostic visits on an existing system have a service fee that is disclosed up front.

Because the equipment is only part of the job. Load calculations, duct corrections, electrical work, permits, commissioning and installation quality can all differ between proposals, so compare the written scopes line by line rather than the bottom-line number alone.

Options include higher-efficiency media filtration, duct sealing, balanced airflow, source control and whole-home air treatment. Filtration is designed to capture airborne particles as air passes through the system, and duct sealing limits unfiltered attic or crawlspace air entering the airstream. What each product does depends on the technology, the installation and how the system runs, so we recommend based on what we measure in the home.

It can. A cooling system removes some moisture while it runs, so longer run times at lower capacity can support dehumidification when the system is correctly sized, designed and configured. Actual humidity control depends on the equipment, the settings and the conditions in the home.

Well-sealed homes may benefit from controlled fresh-air ventilation. Whether ventilation is required or appropriate depends on the project, the home and current local code.

We are based in San Jose and serve the surrounding communities including Campbell, Willow Glen, Los Gatos, Saratoga, Santa Clara, Cupertino, Sunnyvale, Mountain View, Morgan Hill, and more.

Air Care Heating & Cooling holds California contractor license #984584. You can verify current license status, classification and other details directly with the CSLB.

Yes. We support small commercial spaces, offices, and light commercial rooftop equipment in addition to residential homes.

Our Reviews page collects hundreds of customer reviews submitted through the Air Care website, searchable by city and service type.

There is no universal interval worth publishing — the right cadence depends on the equipment, how much it runs, the environment it lives in and the manufacturer’s guidance for that model. Regular maintenance can identify and reduce some issues early, though it cannot prevent every failure. Care Club plans include one or two maintenance visits per year depending on the plan.

Check the filter regularly and replace it when it looks loaded rather than on a fixed calendar. Pets, allergies, dust and how much the system runs all change how quickly a filter loads, and the filter type and depth matter too — follow the guidance for your specific filter. A clean filter supports airflow and reduces avoidable wear. Care Club visits include filter checks depending on the plan.

A loud air conditioning system usually means something is loose, dirty, or worn. Common causes include a clogged air filter, debris around the outdoor unit, or loose panels. Try replacing the filter and clearing debris; if the noise continues, schedule one of our qualified service technicians to check it out. Care Club maintenance visits include cleaning, tightening and testing the items that apply to your equipment; the number of visits each year depends on the plan.

You usually don’t need to cover your outdoor AC unit when it’s not in use. Full covers can trap moisture and invite rust, mold, or pests; if debris is a problem, use a breathable top cover only and leave the sides open. Before turning the system on for the first time each season, schedule a qualified service technician to check the unit.

Yes — a heat pump moves heat from the outdoor air even when it is cold. How much heat it delivers at a given outdoor temperature comes from the manufacturer’s rated performance for that model, which is why heating capacity is checked against the calculated load for your home.

A mini-split is a heating and cooling system with one outdoor unit and one or more indoor units that serve specific rooms. Mini-splits can be ductless, ducted, or a mix of both in the same home, giving you flexible options. Many use inverter technology that adjusts output to match demand; comfort, sound and efficiency depend on the equipment, the design and the installation.

That burning smell the first time you turn on your furnace each season is usually dust that settled during warmer months heating up and burning off. It should fade within 30–60 minutes. Replace the air filter and crack a window to help the smell clear faster. If the odor is strong, smoky, or chemical, or if it doesn’t go away, turn the system off and schedule a qualified service technician to check it.

SEER (Seasonal Energy Efficiency Ratio) is a standardized rating for how much cooling equipment delivers per unit of electricity under seasonal test conditions. You’ll often see SEER2 now — the updated 2023 test procedure — which is the comparable way to measure one model against another. The rating is a laboratory comparison, not a prediction of your bill: actual energy use and cost depend on the equipment match, sizing, installation quality, the home’s load, your utility rates and how the system is operated. One of our comfort advisors can walk through efficiency and sizing options for your home.

Start with simple steps: check the air filter regularly and replace it when it looks loaded, following the guidance for your specific filter and equipment, keep vents clear, and use steady, moderate thermostat settings. Clear leaves and clutter around the outdoor unit and seal obvious air leaks at doors and windows to keep conditioned air inside. Schedule a qualified service technician for maintenance—or use our maintenance program with scheduled visits—to clean and test the items that apply to your system and check applicable settings against the manufacturer’s guidance. These steps support comfort and efficient operation, though they cannot prevent every repair.

You may hear that supply air should be noticeably cooler than return air on a cooling system. It is a rough talking point, not a specification: the expected temperature difference depends on the equipment, the airflow, the filter and ductwork, humidity and operating conditions. If cooling seems weak, check the filter and have a technician measure the system rather than judging it by a rule of thumb.

An AHRI certified system means your specific outdoor and indoor units were tested together by an independent organization to confirm the listed efficiency and performance. That rating is the reliable way to compare a specific outdoor/indoor combination, and rebate programs and manufacturer paperwork often reference it. When you’re looking to replace your system, ask your comfort advisor for the AHRI certificate or number so you know you’re getting what you’re paying for.

AFUE (Annual Fuel Utilization Efficiency) is your furnace’s efficiency score—the percent of fuel that turns into heat for your home over the whole heating season. A 95 AFUE model converts about 95 percent of the fuel it uses into heat over the season. A higher AFUE rating means less fuel is lost, though actual bills also depend on the installation, the home and how the system is used. You’ll find the AFUE on the unit label or paperwork; our comfort advisor can help you choose the right efficiency for your home and climate.

HSPF (Heating Seasonal Performance Factor) is a heat pump’s heating efficiency score—it shows how much heat you get for each unit of electricity over the whole season. HSPF2 is the updated test procedure introduced for newer efficiency ratings, giving a comparable way to measure one model against another. A higher HSPF2 rating means more heat per unit of electricity under test conditions; actual bills also depend on the installation, the home, your rates and how the system is used. Our comfort advisor can walk through the options for your home.

A heat pump is a system that moves heat to keep you comfortable year-round. In cooling mode, the refrigerant flows one way to pull heat from inside and release it outdoors; in heating mode, the flow reverses to bring outdoor heat into your home. Because it transfers heat instead of burning fuel, it can operate efficiently, though operating cost depends on the equipment, the installation and your rates. Our comfort advisor can walk through the options for your home.

A condenser is the outdoor part of your AC or heat pump—the unit with the fan and coil. In cooling mode, it releases indoor heat to the outside; on heat pumps in winter, that same unit can pull heat from the outdoor air. Keeping it clear of leaves and debris supports airflow across the coil. Care Club maintenance visits include cleaning and testing the items that apply to your equipment, and the number of visits each year depends on the plan.

MERV is a standardized filter-efficiency rating; higher ratings are designed to capture a larger share of smaller particles under the test standard. Higher MERV can also restrict airflow if the system and filter cabinet are not set up for it, so the right choice depends on your equipment. We confirm what your system can handle before changing filter type.

An air purifier treats the air as it cycles through your HVAC. Depending on the technology—high-efficiency media, UV-C, or electronic charging—products are designed to capture fine particles like dust, pollen, and pet dander that standard filters can miss, or to reduce certain microbes and odors. The practical benefits are lower concentrations of certain airborne particles, less dust settling on surfaces, and cleaner HVAC components, which helps your system run efficiently. Results depend on the product, the installation, and how the system operates.

HVAC equipment cannot make a health claim, and we do not make one. What the equipment does is mechanical: matched high-efficiency filtration is rated to capture a share of airborne particles passing through the system, UV-C at the coil is used to limit mold and biofilm growth on wet coil surfaces, and in-duct UV-C or air-treatment products are designed to act on certain airborne microbes, odors or VOCs depending on the technology, exposure time and placement. We recommend ozone-free, third-party-tested options and explain what each product is designed to do. No product removes all contaminants, and performance depends on the equipment, the installation and operating conditions. For health questions, talk with your physician.

One room being hotter or colder usually means uneven airflow—common causes are a dirty filter, blocked or closed vents, leaky/undersized ductwork, or extra sun and poor insulation in that room. Start by replacing the filter, opening and clearing all vents/returns, and keeping interior doors open. If it persists, we can perform an airflow test, seal or resize ducts, add a return, or adjust/install balancing dampers or zoning to fix the hot/cold spots. The goal is more even comfort between rooms once the actual airflow problem is identified and corrected.

For replacement design, we use a room-by-room load calculation such as Manual J and review the duct system where it applies to the project. Equipment selection is matched to the calculated load and compatible system components. Startup and commissioning checks then follow the installed equipment and project scope, including airflow, controls and refrigerant-system checks where applicable.

A whole-house fan exhausts indoor air through the attic and draws outdoor air in through open windows, which can flush warm indoor air out when the outdoor air is cooler than the air inside. It suits homes in areas where evenings cool down, and it is not useful when outdoor air is smoky, humid or full of pollen. Because it brings in unfiltered outdoor air, many homeowners avoid running it during wildfire smoke or high-pollen conditions; if outdoor air quality is a concern we can look at filtration or other cooling options instead. We size and install the unit and verify attic venting and the safety items that apply.

Use balanced ventilation with a heat recovery ventilator (HRV). It brings in filtered outdoor air while transferring some heat between the outgoing and incoming air streams; how much heat is recovered depends on the equipment and the operating conditions. We can tie it into your HVAC or install it standalone, then size, balance, and program it to run only when needed. Incentive programs change often, so we confirm what currently applies to your address.

Diamond Certified contractors earn their status through rigorous, independent customer satisfaction research and verified licensing/insurance—only top performers qualify. For you, that means a proven company that’s monitored year-round, not just self-promoted. You can verify our current listing directly with Diamond Certified, and you should confirm current license status and classification directly with the CSLB.

Age by itself does not answer it. Frequent or costly repairs, comfort the system can no longer deliver, and major failures such as a cracked heat exchanger or a failed compressor are the reasons replacement usually comes up. We diagnose first, then give you a written repair-versus-replace comparison — including a load calculation for any replacement scope — so you can compare the two paths line by line.

Absolutely. A replacement recommendation should always be backed by measurements, not a hunch. We regularly find systems that were condemned for a failed capacitor, a clogged coil, a bad control board, or a refrigerant leak that can be repaired.

Our technician re-tests the system independently: refrigerant charge, static pressure, temperature split, electrical draw, heat exchanger condition, and safety controls.

If the system truly is at end of life, we show you the readings behind that conclusion so the decision is yours, not ours.

R-22 systems can still be repaired. U.S. production and import of new R-22 ended in 2020, but existing systems may still be serviced with recycled, reclaimed, or previously produced R-22. Whether repair makes sense depends on the actual fault, the amount of refrigerant involved, system condition, repair history and current refrigerant availability and cost.

An electrical or component repair can be reasonable when the rest of the system is serviceable.

For a refrigerant leak or other major repair, we price the repair and replacement paths side by side rather than using the refrigerant type or equipment age alone.

Existing R410A equipment remains serviceable under current rules. New equipment sold in California has transitioned to lower-global-warming refrigerants such as R-454B, while R410A continues to be used for servicing installed systems.

Whether a repair or a replacement makes more sense depends on the actual fault, the condition and repair history of the equipment, and the availability and cost of refrigerant at the time of the repair.

We price the repair and the replacement side by side so you can compare the two paths.

If the system runs and the house will not get to setpoint on a hot afternoon, something is limiting capacity: a dirty filter or coil, low refrigerant charge, duct losses in a hot attic, a failing component, or equipment that was never sized for the home.

We measure temperature split, static pressure, superheat and subcooling to find which of those it is instead of guessing.

Duct leakage or damaged insulation in a hot attic can reduce the amount of conditioned air that reaches the rooms.

When warm air stops moving across the indoor coil — or the refrigerant charge is low — the coil temperature drops below freezing and condensation turns to ice. The ice then blocks airflow completely, which makes it worse.

Common causes: a clogged filter, a dirty evaporator coil, a failed blower motor, closed or crushed ducts, or a refrigerant leak.

Turn cooling off and arrange service; continuing to run a frozen system can cause additional problems.

Air conditioners and heat pumps remove humidity, and that water has to drain away. When the condensate line clogs with algae or the pan corrodes, water backs up into the closet, attic, or ceiling below.

Many attic installations use secondary drain protection and safety controls; what is required depends on the equipment, installation and current local code.

High-efficiency furnaces also produce condensate and can leak from a blocked trap or cracked hose.

Rattling can come from loose panels or debris; squealing or grinding can indicate blower or motor problems; buzzing can be electrical; a hard bang on furnace startup can indicate an ignition problem. Any burning smell or repeated hard starts should be treated as a safety concern.

Duct systems also make noise when they are undersized — high static pressure creates a rushing or whistling sound at the registers.

A sudden change in sound is more meaningful than the volume itself.

Santa Clara County rarely sees the deep cold that challenges heat pumps, and one system covers both heating and cooling. Heating capacity still has to be verified against the calculated load for the home and the equipment’s rated performance.

California and local utility rebates, plus manufacturer promotions and financing, can lower the installed cost — check the live Rewiring America calculator for incentives currently available at your address, since the former federal 25C tax credit no longer applies to equipment placed in service after 2025.

Some jurisdictions are also steering new construction toward electric equipment; requirements vary by city and change over time.

A heat pump moves heat rather than creating it, so it can deliver more heat energy than the electrical energy it consumes. Whether that lowers your bill depends on the equipment, the installation, your rate plan, the home and how the system is used.

Savings shrink if the home leaks heat or the ductwork is undersized, which is why we evaluate the envelope and duct system, not just the equipment.

We run the numbers for your actual home rather than quoting national averages.

Mechanically they are nearly identical. The heat pump adds a reversing valve, so in winter it pulls heat from outdoor air and moves it inside. Both can provide cooling; actual capacity, efficiency, sound and comfort depend on the specific equipment, sizing, controls and installation.

Project pricing depends on the equipment selected and the scope of the work, so the two options are worth comparing side by side when you are replacing the outdoor unit anyway.

A heat pump may also qualify for California, utility or manufacturer incentives that a straight AC does not — availability changes, so we confirm current programs with your proposal.

A dual fuel (hybrid) system pairs a heat pump with a gas furnace. Compatible controls switch between the two heat sources based on the control logic and conditions they are configured for, such as outdoor temperature. The system does not monitor utility rates on its own.

The changeover point is configured at the thermostat or control, so the switch happens without you managing it.

It can be an option for homeowners who want heat-pump heating while retaining a compatible gas furnace.

Premium equipment installed poorly can perform worse than mid-tier equipment installed correctly. Incorrect refrigerant charge, undersized ducts, poor airflow and skipped commissioning all reduce how a system performs in the home.

Replacement design can include a Manual J load calculation, a duct and airflow review where applicable, equipment matching, and the startup and commissioning checks appropriate to the system being installed.

Findings and readings are documented as appropriate to the project so you can see what was verified.

Balancing measures the airflow at each register and adjusts dampers, duct sizes, and blower speed until the delivered air matches the room-by-room design. It can be an important part of getting a ducted system to deliver the intended room-by-room airflow.

Poor balancing can leave some rooms under-served while others receive more airflow than intended.

Where balancing is part of the scope, we measure system airflow/static pressure and adjust applicable dampers or branches.

Depending on the equipment, a visit can cover electrical connections and amp draw, capacitors and contactors, refrigerant-circuit performance, airflow and static pressure, blower condition, condensate drains, safety controls, combustion and heat-exchanger items on gas equipment, thermostat operation and filtration. What applies depends on the system in front of the technician.

Cleaning and drain service are performed where they apply to the equipment and its condition.

The technician reviews what was found with you and documents the findings and any recommendations.

Dirty filters or coils can restrict airflow and make the system work harder. Maintenance can identify some developing issues before they become service calls, but it cannot prevent every failure.

Many manufacturers expect documented maintenance when reviewing parts warranty claims — check your specific warranty terms.

Deferred maintenance is a common factor in avoidable failures, though maintenance cannot prevent every failure.

UV-C at a wet coil can be used to limit microbial growth on that surface, such as mold or biofilm. Air passing by at duct speed gets far less exposure, so UV alone will not clean the air in your home.

Filtration is the primary tool for capturing airborne particles passing through the filter; UV-C at the coil acts on the coil surface itself.

Performance depends on the product, placement, exposure time and system conditions.

Many common household allergens are airborne particles that circulate through the duct system. A deep-media filter rated for finer particles, sealing leaky return ducts that pull attic and crawlspace air into the airstream, and controlled fresh-air ventilation all act on the particles moving through the system. We do not make medical claims about symptoms — talk with your physician about those.

A one-inch filter in a dirty return grille can limit the filtration performance of that system.

Leaky return ducts can pull unfiltered attic dust directly into your air stream.

Parts coverage and the registration window vary by manufacturer and model, and labor coverage is separate and comes from the installing contractor. We can look up the coverage from the model and serial numbers on your equipment.

Send us a photo of the data plate on your indoor and outdoor units and we will check the coverage for you.

For systems we install, we can tell you what registration steps apply and what documentation to keep.

There is no universal list. Warranty terms vary by manufacturer and by product, and they may include requirements such as product registration, installation and service conditions, maintenance, or the use of approved replacement parts. A claim decision is made under the terms of that specific written warranty.

Read the written warranty that came with your equipment so you know what it requires of you.

Keep your registration confirmation, invoices and service records with your home records.

Manufacturer warranties commonly cover eligible parts, subject to the written terms. Diagnostic labor, refrigerant and the labor to install the part may be billed separately unless labor coverage applies through the installing contractor or an extended labor plan. Check the specific warranty for your equipment.

Air Care installations include our own labor warranty, and extended labor coverage is available.

Care Club plans include a repair discount and a repair warranty; the discount and warranty length depend on the plan.

Unexpected repairs rarely arrive at a convenient time. Our financing through Wells Fargo can be used for larger repairs, not only full system replacements, subject to credit approval and minimum amounts.

Financing is subject to credit approval, program terms and any applicable minimum amount; reviewing options does not obligate you to proceed.

If the repair is large relative to system value, we will also price replacement so you can compare monthly cost.

Packaged rooftop units (RTUs) combine heating and cooling in a single cabinet and serve most small commercial buildings, retail spaces, and offices. We handle diagnostics, economizer repair, belt and motor service, curb adapters, and full change-outs with crane setting.

We coordinate access and scheduling around the site’s operating needs where practical.

Permit, documentation and inspection requirements depend on the scope, and we confirm who handles them in the written proposal.

Commercial agreements are built around your equipment list and occupancy. Visits typically include filter changes, belt inspection and replacement, coil cleaning, economizer and damper checks, refrigerant performance testing, electrical inspection, and drain service.

You receive per-unit reporting so budgeting and capital planning are straightforward.

For multi-location customers, scheduling and reporting can be coordinated across locations when that is part of the service agreement.

For a business, HVAC failures can affect comfort and operations. Preventive maintenance gives the technician opportunities to identify conditions such as worn belts, weak electrical components or dirty coils before they contribute to a service call, but it cannot prevent every failure.

Scheduled visits are planned around your equipment list rather than arranged as emergency calls.

Many manufacturers expect documented maintenance when reviewing warranty claims — review the terms for your equipment.