What's Behind the Warm Air
When your air conditioner blows warm air, it almost always comes down to one of a handful of causes. Some you can rule out yourself. Others need a tech with gauges and refrigerant certification. Here's how we sort it out. 1. Start with the thermostat It sounds too simple, but it's the first thing we check. Make sure it's set to COOL, not just FAN. If the fan is set to "ON" instead of "AUTO," the blower runs even when the system isn't actively cooling — so you feel room-temperature air pushing through the vents. Set it to COOL and AUTO, drop the temperature a few degrees, and wait to see if cold air kicks in. 2. Check your air filter A clogged filter chokes off airflow across the indoor coil. When that happens, the coil can ice over and your system loses its ability to cool. Pull the filter. If you can't see light through it, it's overdue. Swap it, give the system time to thaw if it's frozen, and see if things improve. In our dusty Florida homes, filters need changing every 30–60 days during peak cooling season. 3. Look at the outdoor unit Walk outside to the condenser — the big unit with the fan. Is the fan spinning? Is it caked in grass clippings, leaves, or dryer lint? That outdo
