HVAC Frequently Asked Questions.

The most common reasons an AC runs but doesn't cool are a dirty air filter, a frozen evaporator coil, low refrigerant from a leak, a dirty or blocked outdoor condenser, or a failed capacitor. Check the filter, thermostat, breaker, and condenser clearance first; if cooling doesn't return, call for professional service.

Run a 5-minute checklist: confirm the thermostat is set to COOL with a setpoint at least 3°F below room temperature, check and replace a dirty air filter, look for ice on the copper lines, verify the AC breaker is on, and confirm the outdoor condenser has 2 feet of clearance and clean fins. If all check out and the AC still won't cool, call a professional.

Ice on the copper lines usually means restricted airflow (dirty filter or blocked condenser) or low refrigerant from a leak. Shut the AC off immediately — running a frozen coil can destroy the compressor — replace the filter, let it thaw for 1–2 hours, then restart. If it freezes again, you need professional service to find and fix the leak.

Grinding, rattling, squealing, buzzing, or humming usually point to a specific failure: rattling often means a loose fan blade or debris in the condenser, squealing can indicate a failing blower motor bearing, buzzing often signals a failing capacitor or contactor, and grinding can indicate a compressor problem. Shut the system off and call for service to prevent further damage.

Uneven cooling is usually caused by leaky or poorly designed ductwork, an undersized system, a stuck zoning damper, or closed/blocked supply vents. A professional duct inspection identifies hidden losses that can waste 20–30% of conditioned air. Sealing and balancing ductwork is the most common fix.

A clammy feeling usually means your AC is oversized and short-cycling — cooling the air quickly but not running long enough to remove North Texas humidity. A properly sized system that runs longer dehumidifies effectively. A professional can verify sizing and adjust fan speed and staging, or add a whole-home dehumidifier.

A humming outdoor unit that won't start almost always points to a failed capacitor — the electrical component that starts the compressor and fan motor. It's a fast, affordable professional repair. Do not try to replace it yourself; capacitors hold a dangerous electrical charge even after power is disconnected.

We recommend professional maintenance twice a year — once in spring for your cooling system and once in fall for your heating system. Regular tune-ups keep equipment efficient, catch small issues before they become costly, and extend the life of your investment. Annual maintenance also preserves your manufacturer warranty.

Most homes benefit from a new filter every 1–3 months. During a North Texas summer, check monthly and replace every 30–60 days due to heavy dust and pollen. Homes with pets, allergies, or heavier dust may need monthly changes. Use a MERV 8–11 filter unless your system is rated for higher.

A professional AC tune-up includes refrigerant charge verification, chemical coil cleaning, evaporator coil inspection, electrical component testing (capacitors, contactors, wiring), condensate drain cleaning, blower and airflow checks, thermostat calibration, and a safety and performance test. It restores efficiency and confirms the system is ready for summer.

Replacing the air filter every 30–60 days during summer is the single most important homeowner task. A clogged filter chokes airflow, freezes the evaporator coil, and strains the compressor. Keep the outdoor condenser clear with 2 feet of clearance and hose the fins monthly as well.

Refrigerant doesn't get used up — your system is sealed. If your refrigerant is low, you have a leak that needs to be located and repaired. Simply 'topping off' refrigerant without fixing the leak wastes money and damages the environment. We locate the leak with electronic detection, repair it, and recharge to manufacturer specs.

Yes. Our maintenance plan includes spring and fall tune-ups, priority dispatch during heat waves, a 15% repair discount, no overtime fees for evening and weekend service, and documented maintenance that preserves your manufacturer warranty. Members avoid the vast majority of midsummer breakdowns.

Apply the $5,000 rule: multiply your system's age by the repair cost. If the result exceeds $5,000, replacement is usually more economical. Also favor replacement if the system uses banned R-22 refrigerant, is over 15 years old, needs frequent repairs, or faces a major component failure like a compressor or coil. We always give you an honest assessment with transparent pricing for both options — never pressure to replace.

The average central air conditioner lasts 10 to 15 years in North Texas. DFW's sustained summer heat, humidity, and heavy pollen cut lifespan compared to milder climates. Annual maintenance and regular filter changes push your system toward the upper end of that range; skipping maintenance can bring it down to 10 years.

In most cases, yes. R-22 has been banned for new production and is increasingly unavailable, so recharging a leaky R-22 system is expensive and supplies are scarce. A refrigerant leak on an R-22 system typically costs more to repair than the system is worth. Replacing with a modern R-410A or R-32 system is usually the better long-term investment.

Replace when your system is over 12–15 years old, uses R-22 refrigerant, needs frequent repairs (two or more per season), has rising energy bills, produces uneven cooling, makes strange sounds, runs constantly without reaching the setpoint, or faces a major component failure like a compressor or evaporator coil.

Yes. A modern 16 SEER2+ system can cut North Texas cooling bills 20–40% compared to a 10-year-old unit. On a $300/month summer cooling bill, that's $60–$120 per month in savings — which can offset a significant portion of a monthly financing payment, sometimes making the upgrade effectively pay for itself.

Most AC repairs cost between $180 and $900. A capacitor or contactor replacement runs $180–$300, a refrigerant leak repair and recharge $350–$900, a condensate drain cleaning $150–$250, and a blower motor replacement $450–$750. Major repairs like a compressor or evaporator coil replacement run $1,200–$3,500. AIRmazing provides upfront flat-rate pricing before any work begins.

AC replacement in North Texas typically costs $5,500–$12,500 for a residential system, depending on size, efficiency, and installation complexity. A standard 14 SEER2 system runs $5,500–$7,500, a 16 SEER2 high-efficiency system $7,000–$9,500, and an 18–20 SEER2 variable-speed system $9,000–$12,500. Full system plus new ductwork runs $10,000–$16,000.

We give upfront, flat-rate pricing. After diagnosing your system, we provide a single upfront price for the repair — approved before any work begins. You know the full cost before we touch your system, with no surprises, no overtime padding, and no hourly billing that incentivizes slowness.

Yes, we charge a fair diagnostic fee to cover the technician's time and expertise, and it's credited toward your repair if you choose to proceed. We avoid 'free' diagnostics, which usually mean inflated repair prices to recover the cost. Transparent, honest pricing is the standard at AIRmazing.

Yes. We partner with trusted financing providers to offer flexible payment options for installations and major repairs. Because a modern high-efficiency system can cut cooling bills 20–40%, the monthly financing payment is often lower than the energy savings — meaning the upgrade can effectively pay for itself from day one. Ask your technician or call our office for current plans and terms.

Not for maintenance plan members. Our membership includes no overtime fees for evening, weekend, or holiday service — you pay the same flat rate any time of day. Non-members pay standard after-hours rates, which are always disclosed upfront before any work begins.

Yes. Heating and cooling emergencies don't wait for business hours, and neither do we. Call (214) 555-5555 any time, day or night, and we'll dispatch a technician as quickly as possible. We offer same-day and emergency service across North Texas including evenings, weekends, and holidays during peak summer.

Call for emergency service if your AC fails during extreme heat (95°F+), especially with elderly residents, infants, or anyone with health conditions in the home; if you smell burning or electrical odors; if you see ice on the lines after thawing; or if the outdoor unit is smoking or making loud grinding sounds. Don't wait — heat-related illness is a real risk in North Texas.

Our technicians are based across the DFW metroplex, so we reach most North Texas homes the same day — often within a few hours for emergency calls. Maintenance plan members receive priority dispatch and jump the line during heat waves and cold snaps. Call (214) 555-5555 for current availability.

Turn the AC off if it's blowing warm air or making loud sounds to prevent further damage. Close blinds and curtains to block solar heat, use fans for personal cooling, stay hydrated, and if anyone in the home is at risk during extreme heat, consider relocating to a cooled public space like a library or mall until service arrives.

Upgrade your air filtration to MERV 11–13, control indoor humidity to 30–50%, add UV-C air purification, clean and seal your ductwork, add mechanical ventilation (ERV/HRV) in tight modern homes, and maintain your HVAC system with annual tune-ups. A professional indoor air quality assessment identifies your home's specific challenges.

A MERV 11–13 filter is the best balance for most North Texas homes with allergy concerns — it captures most pollen, fine dust, and allergens without overly restricting airflow. Higher MERV ratings (13–16) capture finer particles but require verifying your system can handle the airflow restriction. We can measure your system's static pressure and recommend the right filter.

In tight, well-insulated North Texas homes, allergens and pollutants get trapped and recirculated every time the HVAC system runs. Pollen, dust, pet dander, and biological growth in ductwork build up. Upgrading filtration, adding UV-C purification, and cleaning ductwork dramatically reduces indoor allergen levels.

Yes. UV-C light systems installed at the evaporator coil and in the air stream kill mold, bacteria, and viruses, preventing biological growth on the coil and reducing airborne pathogens. They're most effective as part of a complete indoor air quality strategy that includes proper filtration, humidity control, and duct cleanliness.

Target 30–50% indoor relative humidity. Above 55% promotes mold, dust mites, and clammy air; below 30% dries out sinuses, skin, and woodwork. A properly sized AC dehumidifies in summer. In stubborn cases — especially lakeside homes — a whole-home dehumidifier provides consistent control. A whole-home humidifier adds moisture in dry winters.

Proper sizing is determined by a Manual J load calculation, which accounts for your home's square footage, insulation, windows, orientation, ceiling height, local climate, and occupancy. We never guess by square footage alone. An oversized system short-cycles and dehumidifies poorly; an undersized system runs constantly without catching up. Correct sizing is critical for comfort, efficiency, and equipment life.

A complete installation includes removal and disposal of the old equipment, the new outdoor condenser, indoor evaporator coil, and (if replacing) furnace or air handler, new refrigerant lines as needed, electrical connections, thermostat, system start-up and commissioning, and a performance test verifying proper charge and airflow. We document everything for your warranty.

A standard residential AC replacement typically takes one day. A full HVAC system replacement (AC + furnace or heat pump) can take one to two days. Complex installations involving ductwork modifications or multi-zone systems may take longer. We always give you a clear timeline before we begin.

For North Texas's cooling-dominated climate, we recommend 16 SEER2 or higher. Higher SEER ratings cost more upfront but save significantly on cooling bills over the system's 15-year life. The North Texas climate makes the higher efficiency worth it. A 16 SEER2 system can cut cooling costs 20–40% versus a 10-year-old unit.

A mid-tier system installed perfectly outperforms a premium system installed poorly. The contractor controls sizing, refrigerant charge, airflow, duct integrity, and commissioning — the factors that determine efficiency, comfort, and lifespan. This is why choosing the right contractor matters more than choosing the right brand.

For most North Texas homeowners, a heat pump is the better choice because the mild winter climate keeps it in its efficient range, cooling performance equals a traditional AC, upfront cost is comparable, operating costs are competitive (often lower), and it's safer and greener with no on-site combustion. A dual-fuel system is a strong option if you have existing gas service.

Yes. Modern heat pumps heat efficiently down to 30–40°F, and cold-climate models work well below that. North Texas winters rarely drop below 20°F, and most winter days are 40–60°F — well within a heat pump's efficient range. Electric resistance backup (aux heat) runs only a handful of days per year, keeping heating costs low.

Common causes include a faulty igniter or flame sensor, a tripped breaker or blown fuse, a dirty flame sensor, low gas pressure, a stuck pressure switch, or a cracked heat exchanger. If your furnace blows cold air, check the thermostat and breaker first, then call for service. A cracked heat exchanger is a carbon monoxide risk and requires immediate furnace replacement.

Any gas furnace should have working carbon monoxide detectors on every floor and near sleeping areas. A cracked heat exchanger can leak carbon monoxide into your home. Annual fall maintenance includes a heat exchanger inspection and safety check that catches cracks before they become dangerous. If your CO detector alarms, evacuate and call 911.

Yes. We service and install both heat pumps and traditional AC + furnace systems from all major brands, including variable-speed and inverter-driven equipment, dual-fuel systems, and cold-climate heat pumps. Our NATE-certified technicians will recommend the right system for your home, utility rates, and preferences.

Set your AC to 78°F when you're home and awake — it's the sweet spot that saves significant energy while staying comfortable. Raise it to 85°F when away at work, 75–78°F when sleeping with ceiling fans, and never turn it fully off when leaving for the day. Each degree below 78°F increases cooling costs by roughly 3–6%.

No. Turning the AC off lets humidity and stored heat climb, so the system runs hard for hours to recover — often costing more than maintaining a higher setpoint. Set the thermostat to 85°F while away instead. This keeps humidity controlled and gives the system a manageable recovery load when you return.

Yes. A properly programmed smart thermostat automates setbacks — raising the setpoint when you leave and lowering it before you return. North Texas homeowners save 10–23% on cooling with one. Features like geofencing, learning schedules, and humidity awareness optimize comfort and efficiency automatically.

Set your thermostat to 78°F, use ceiling fans, replace the air filter every 30–60 days, schedule annual maintenance, keep the outdoor condenser clear, use a smart thermostat, block solar heat gain through windows, seal air leaks, add attic insulation, seal and insulate ductwork, and time heat-producing appliances like the oven and dryer for evening hours.

Yes, if used correctly. Ceiling fans cool people, not rooms, through a wind-chill effect. Running fans in occupied rooms lets you set the thermostat 3–4°F higher and feel just as comfortable, cutting cooling costs 10–15%. Set fan direction to counterclockwise in summer for a downward breeze, and turn fans off when you leave a room.

We proudly serve homes and businesses across Texas, Oklahoma, Kansas, Missouri, and Louisiana. In North Texas specifically, we cover Dallas, Frisco, Plano, McKinney, Denton, Allen, Lewisville, The Colony, Wylie, Murphy, Prosper, Celina, Anna, Melissa, Princeton, Sherman, Denison, Gunter, and Pilot Point. If you're unsure whether we reach your zip code, call (214) 555-5555 and we'll confirm right away.

We're open 24 hours, 7 days a week. Our regular scheduling hours cover standard business days, but emergency service is available around the clock — including evenings, weekends, and holidays. Call (214) 555-5555 any time to reach us.

Yes. We service homes and light commercial properties across North Texas, including rooftop and commercial HVAC equipment common in Sherman's medical and industrial base. Our NATE-certified technicians handle both residential and commercial service, maintenance, and installation.

Yes. We offer same-day service whenever possible, and emergency service 24/7. Our DFW-based technicians reach most North Texas homes the same day you call — often within a few hours for emergencies. Maintenance plan members receive priority dispatch during peak demand.

Absolutely. Every AIRmazing technician is NATE-certified, EPA-certified, fully licensed, and insured. We also background-check every technician. You can feel confident letting us into your home or business.

Our technicians are trained and certified to service and install all major premium brands, including Trane, Carrier, Lennox, Rheem, Goodman, American Standard, Amana, Daikin, and more — including modern variable-speed and inverter-driven equipment.

Yes. All AIRmazing repairs include a warranty on parts and labor. New system installations carry the manufacturer's parts warranty (typically 10 years) plus our labor warranty. If a repair we performed fails within the warranty period, we return and fix it at no charge. Your satisfaction is guaranteed.

You can book online through our scheduling tool, or call (214) 555-5555 to speak with a real person. We offer same-day windows whenever possible and 24/7 emergency service. There's no obligation to book — we're happy to answer questions first.

No. We're known for honest repair-vs-replace guidance. We give you a straight assessment of your system's condition, transparent pricing for both repair and replacement options, and a clear recommendation based on the $5,000 rule and your situation. We will never pressure you to replace a system that can be reasonably repaired.

Yes. AIRmazing is locally owned and operated, serving North Texas and the surrounding region. Our technicians live and work across the DFW metroplex, so we understand the local climate, housing stock, and the specific HVAC challenges North Texas homeowners face. When you call, you reach a team that knows your area.