Resources
HVAC guides
Short, direct answers about what your system is doing and what to do next, with notes for different U.S. climates.
Troubleshooting
AC Blowing Warm Air? 7 Causes and What to Check FirstCheck the thermostat is set to Cool, replace a dirty filter, and confirm the outdoor unit is running. If the outdoor fan is still, the coil is frozen, or the breaker trips, turn the system off and call a technician: those point to a capacitor, contactor, refrigerant leak or motor failure.Why Is My AC Frozen? Ice on the Line or Coil ExplainedAC coils freeze when too little warm air passes over them (dirty filter, closed vents, weak blower) or the refrigerant charge is low from a leak. Turn cooling off, run the fan to thaw, replace the filter, and call a tech if it freezes again.AC Won't Turn On: A Step-by-Step ChecklistWhen the AC won't start at all, check the thermostat display, the breaker, the outdoor disconnect, the furnace or air handler switch, and the condensate float switch. A blank thermostat often means a tripped float switch or a blown 3-amp fuse on the control board.Water Dripping From the Ceiling Under Your ACTurn the AC off to stop more water, put a bucket under the drip, and check the secondary drain pan. Most ceiling leaks under an attic air handler come from a clogged condensate drain, a cracked pan or a missing float switch.Furnace Won't Ignite or Keeps Shutting OffIf a furnace lights then shuts off within seconds, a dirty flame sensor is the most likely cause. No ignition at all points to the igniter, pressure switch or gas supply. Read the blinking LED code through the panel window and give it to the tech.
Buying guides
Repair or Replace Your AC? A Decision GuideReplace when the system is past about 12–15 years, uses R-22 and has a leak, or a repair costs more than about a third of a new system. Repair when it's under 10 years old and the failure is a single part like a capacitor, contactor or fan motor.Heat Pump vs. Gas Furnace in NevadaIn Las Vegas, a heat pump usually wins: winters are mild and it replaces the AC too. In Reno, Sparks and Carson City, a cold-climate heat pump or a dual-fuel system (heat pump plus gas furnace) balances efficiency and comfort on the coldest nights.How to Choose an HVAC ContractorVerify the contractor's license with your state or local licensing authority, ask for written quotes with model numbers and permit included, and expect a load calculation for replacements. Be cautious of pressure to sign on the spot or prices quoted without measurements.
Heating
Air quality
Dust Storms and Wildfire Smoke: Protecting Indoor AirDuring dust or smoke events, close windows, run the HVAC fan with the best filter your system can handle (ideally MERV 13 in a media cabinet), turn off fresh-air intakes, and replace the filter afterward. A portable HEPA purifier helps in bedrooms.HVAC Filter Guide: Sizes, MERV Ratings and How OftenUse the size printed on your current filter's frame and a MERV 8 to 11 for most 1-inch slots. Change 1-inch filters every 30–60 days in Las Vegas, more often during dust season or with pets. Deep 4–5 inch media filters last 6–12 months.
Cooling
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