Low air flow means the outdoor unit can’t properly complete the cooling cycle. The result: an air conditioner blowing hot air into your space. Being uncomfortable isn’t the only problem caused by low air flow. The evaporator coil in the HVAC can freeze over, causing further damage to the system.. If your furnace is blowing warm air and not hot air, this could be due to your thermostat regulating the temperature in your home. However, there are other reasons why this occurs such as dirty vents, outside air in your vents, poor furnace performance, and having the wrong size furnace for your home. A little bit of troubleshooting can go a.
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A more common mistake (and the one he made!) is changing the fan from “auto” to “on”, which causes the fan to blow air when the system isn’t running. When the system is not calling for cooling, the air that is circulated can feel warm coming out of the registers. Luckily, this is a very simple fix. Simply change the thermostat back to.. To make sure this isn’t your problem, do the following: Make sure your furnace is on heating mode. Set the fan to AUTO, not ON. If you’re still having a problem after doing these two things, then this isn’t what’s causing the warm air. It’s also possible that your thermostat’s battery is low.