Alaska HVAC Help
A close-up of an ice-glazed tree branch covered in snow and hanging icicles, photographed during an active winter storm with a snow-covered house in the background.

Furnace Installation in Kupreanof, AK

Tell us about the house, and a licensed contractor who covers Petersburg Borough will get in touch.

Tell us about the job

It takes about a minute.

Step 1 of 3: Equipment
An unfinished basement containing a gray HVAC furnace with ductwork, exposed wooden joists, a concrete floor, and miscellaneous clutter in one corner.

A furnace that runs all year in Kupreanof

Winter nights here average 28°F from December through February, but a furnace in Kupreanof doesn't get the rest of the year off. Homes need heat all 12 months, so whatever you install is working through the mild months too, not just the cold ones.

More than half of homes here heat with electricity, and the power doesn't always stay on. In Alaska, 21% of households went at least 24 hours without power last year, and this area has recorded five winter storms and two damaging wind events over the past ten years. That's worth asking about when you choose a furnace, since even a gas or oil furnace needs electricity to run its ignition and controls. Any new non-weatherized gas furnace also has to meet a federal minimum of 80.0 percent AFUE, so that much is set no matter which one you pick.

28°F
the average winter night it heats against
80% AFUE
the federal minimum any new unit must meet
Isometric cutaway illustration of a single-story house showing interior rooms, furniture, a dark furnace unit with a tall vertical flue pipe, and ductwork running under the pitched shingle roof.
Your furnace works hardest from October through April.

NOAA 1991–2020 monthly normals

Alaska requires contractors to register with the state.

Registration puts a contractor's business on file with the state. Nobody tested their work to get on that list, and nothing about the listing tells you how they handle a furnace install. It is a record, not a credential.

For this job, the protection comes from the permit. In most cities and counties, putting in a new furnace needs a permit from the local building office, and an inspector checks the work once it is done. That inspection is what stands between you and a bad gas connection or a furnace vented wrong, not the state registration.

Source: Alaska Department of Commerce, Community, and Economic Development

What size furnace does my house need?
It depends on your home's square footage, how well it's insulated, your ceiling height, and how many windows you have. A furnace that's too big will cycle on and off too fast and never run long enough to heat evenly. One that's too small will run constantly and still leave rooms cold. A contractor will do a load calculation on your actual house to size it right, and with heat needed here 12 months a year, getting that number right matters.
How do I know it's time to replace my furnace?
Watch for rooms that won't heat evenly, a furnace that cycles more often than it used to, or a jump in your heating bills without a clear reason. An older furnace works harder to do what it used to do easily, and repairs tend to cost more as it ages. If yours is needing repairs more than once a season, that's usually the point where replacement starts to make more sense than fixing it again. A contractor can look at its condition and tell you where you stand.
Is a high-efficiency furnace worth it?
For a home that needs heat all year like this one, a high-efficiency furnace has more chances to earn back the difference than it would somewhere with a short winter. Every new non-weatherized gas furnace sold today already has to hit at least 80 percent AFUE by law, so the real question is whether to go higher than that baseline. A higher-efficiency model costs more upfront but uses less fuel for every degree it puts out, and with winter lows averaging 28°F from December through February, that adds up over months of steady use. A contractor can walk you through the models available and what each one would mean for your house.