What are the most common HVAC problems at home?

Simple checks to try first

Make sure the thermostat has power and is set to Heat, with the temperature above the room's. If the display is blank, replace the thermostat batteries.

Check that the furnace power switch is on and its breaker hasn't tripped. The air handler might also stop because of a blown fuse.

A dirty or clogged filter can restrict airflow and add to heating problems. Make sure supply and return vents are open and nothing blocks them.

Coils and drain lines

House dust, soot or pollen can block the indoor air handler coils. Debris can also stick to the inlet side of the cooling coil.

Without maintenance, the AC drain line will clog with debris and gunk.

Gas, oil and electrical parts

Don't try to diagnose or repair gas, oil, combustion or electrical parts yourself.

If you smell gas, don't use electrical switches or try to relight the furnace. Leave the house and call your gas company or 911 from a safe place.