Furnace Installation in Martinsburg, WV
A new furnace here will run from October through April every year. Tell us about the house, and a licensed contractor who covers Berkeley County will get in touch.
Tell us about the job
It takes about a minute.
Seven months of heat, and nights that drop to 25°F
Martinsburg needs heat from October through April. That's most of the year your furnace is expected to run, on winter nights that average 25°F. A furnace sized and installed right has to carry that load night after night, not just handle a cold snap.
Power doesn't always hold up here. Berkeley County has seen 20 winter storms and 90 damaging wind events over the past ten years, and across West Virginia over a third of households lost power for at least 24 hours in 2024. Most homes here heat with electricity, so when a furnace goes in, it's worth knowing what happens to your heat if the power drops. Any new gas furnace also has to meet the federal minimum of 80 percent AFUE, so it's turning most of the fuel it burns into heat for your house.
- 7 months
- October through April, your furnace is on duty
- 25°F
- the average winter night it heats against
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
West Virginia requires HVAC contractors to hold a state license.
The license comes from the state Commissioner of Labor, and it is tied to the contractor, not to any single job. That office is the one that tested the contractor and keeps the record of who holds a valid license. It does not mean a state inspector reviews every installation that gets done under it.
For a furnace install in Berkeley County, that record is what backs up whoever does the work. Beyond that, most cities and counties require a permit from the local building office for a furnace swap, along with an inspection once the work is finished. That inspection is where the gas connections and venting get looked at by someone other than the installer.
Source: West Virginia Legislature
- What size furnace does my house need?
- The right size depends on your square footage, your insulation, your windows, and your home's layout, so there is no number that works for every house. A contractor sizes a furnace by running a load calculation on your specific home, not by square footage alone. Going bigger than what the calculation shows is not a safety margin, it makes the furnace short cycle and wear out faster. With winter lows here averaging 25°F, getting the size right matters more than it would somewhere milder.
- How do I know it's time to replace my furnace?
- Watch for repairs that keep coming back, a furnace that struggles to keep the house warm, or one that is old enough that parts are getting harder to find. Homes here need heat from October through April, seven months of the year, so a furnace that is already weak going into that stretch is worth replacing before it fails on a cold night. Rising bills for the same amount of heat is another sign, since it usually means the furnace is working harder to do the same job. If a contractor has told you the heat exchanger is cracked, that furnace needs to be replaced, not repaired.
- Is a high-efficiency furnace worth it?
- Any new non-weatherized gas furnace has to hit at least 80.0 percent AFUE by law, so the question is really whether to go higher than that, into the 90-plus range. A higher AFUE furnace turns more of the fuel it burns into heat for your house and sends less out the flue. Whether the difference is worth it for you depends on how long you plan to stay in the house and what your current furnace costs to run, and a contractor can walk through those numbers for your specific situation. With seven months of heating season here, a more efficient furnace has more months each year to make a difference.