What's Wrong With It?

HVAC (Heating/Cooling)

No heat or cooling coming from the system at all

Likely cause, what to safely try first, and whether it gets worse if you wait.

Likely cause

A thermostat setting/battery issue, a tripped breaker, or (for furnaces) a pilot light/ignitor that's gone out.

What to try first

Check the thermostat batteries and that it's set to heat/cool correctly and to a temperature above/below room temp.
Check your breaker panel for a tripped HVAC breaker and reset it once, firmly.

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