Keeping the Furnace and AC On in an Outage - A Plain-English Guide
Last verified: September 2026
How to keep heat in winter and cooling in summer when the power goes out — why a gas furnace still needs electricity, how a standby can run central air, and the honest truth about electric heat. Rather talk it through? My number is (330) 200-8042.
Keeping the Furnace and AC On, at a Glance
A gas furnace makes its heat by burning fuel — but it still needs electricity for its blower fan and controls, so a whole-home standby keeps the heat on. Central air is the bigger challenge: its compressor has a large starting surge that a soft-start device or load management can help a mid-sized unit handle. This guide covers heat, cooling, and the honest story on heat pumps and electric heat. There's a printable 29-page version up top.
Common Questions
1 If my heat is gas, do I need a generator for it?
Yes. A gas furnace still needs electricity for its blower fan and controls — without power, the warm air never reaches your rooms. The good news is it's a modest load, one of the easier wins with a standby.
2 Can a standby generator run my central air conditioning?
Often yes, with planning. The compressor's large starting surge is the hurdle; a soft-start device and/or load management can bring central air within reach of a mid-sized unit. It's a load-calc question — our sizing and load-management guides cover it.
3 What about a heat pump or electric baseboard heat?
Those make the heat itself with electricity, so they're much heavier loads. Plenty of homes run them on a properly sized standby, but it deserves a careful load calculation and an honest whole-house-versus-essentials conversation.
4 What is a soft-start device?
A device fitted to your AC compressor that eases it up to speed instead of letting it slam on all at once, shrinking the surge. It often lets a smaller standby run the AC. Our load-management guide covers it in full.
5 Should I back up the whole house or just the essentials?
Whichever fits your climate, health, and budget. A larger unit runs everything; a smaller one plus load management covers chosen comfort. A load calculation from a licensed installer settles it.
6 Is losing heat or cooling ever a real safety concern?
For some folks, yes — a long winter outage or a summer heat wave can matter to health. A standby keeps comfort steady. This isn't medical advice, though; if steady temperature matters for someone's health, raise it with their doctor.
Would You Rather I Just Help?
Keeping the heat — and the cooling — on is one of the most common reasons folks call me about a standby. I'll help you figure out what your furnace and AC actually need, plan honestly for the compressor surge and any electric heat, and line up the licensed pros for the work. I don't sell any of it, so it's just honest advice. $99 flat for a visit, 30-day come-back-free.
Would you rather I just do this for you?
No shame in it — plenty of folks would rather hand it off, and that's what I'm here for. I'll come to your home, set it up right, and make sure it's working before I leave. Flat $99 per visit — no jargon, no upsell, and every visit is 30-day come-back-free.
Not a hardware job? I can often fix it remotely for $49 — a secure screen-share, up to 2 hours, that you watch the whole time and can end whenever (included free for $39/mo Support Plan members, and it counts toward the $99 if it turns out I need to come out).