Do you?

Fire up the heating units in summer months? If not why?
TIA,
G

If the thermostat will go above the ambient temp in the house I do. I’ve done a few houses with bad ACs where the thermostat wouldn’t go high enough. I keep the runtime very short during hot days.

Same as Chuck.

Ditto

As long as its not a heat pump, correct? And if it is a heat pump, check the emergency heat only?

Correct.

why?

Bruce, I actually learned that from a thread here on the NACHI board. Couldn’t locate but found this on line.
http://www.prospex.us/DOCS/HVAC/OEHHM.pdf