Furnace Installation in Alexandria, VA
A new furnace here will run from October through April every year. Tell us about the house, and a licensed contractor who covers Alexandria will get in touch.
Tell us about the job
It takes about a minute.
Seven months of heating a year in Alexandria
Alexandria homes run the furnace from October through April, seven months of the year. Winter nights average 29°F, so a furnace here isn't just handling the odd cold snap, it's cycling on most nights for half the year.
Any furnace installed now has to meet 80.0 percent AFUE at minimum, the federal efficiency floor for gas furnaces built since late 2015. Power matters too. Close to half of homes in the area heat with electricity, and the region has seen 8 winter storms and 31 damaging wind events over the past ten years. In Virginia, 22 percent of households lost power for at least 24 hours in 2024, which is worth thinking about when you're choosing how your new furnace runs.
- 7 months
- October through April, your furnace is on duty
- 29°F
- the average winter night it heats against
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
Virginia requires HVAC contractors to hold a state license.
The Board for Contractors tests and licenses the contractor, not each job. That license has to be in place no matter what they install. Virginia does carve out one exception. Work under $1,000 does not need a licensed contractor. A furnace installation costs well past that line, so the contractor on this job is expected to hold the license.
The license is what stands behind the person doing the work. The installation itself still gets checked a second way. In most cities and counties, putting in a new furnace needs a permit from the local building office. An inspection follows once the work is done. That inspection confirms the furnace was installed correctly. It is separate from whatever the license already says about the contractor.
Sources: Virginia General Assembly · Virginia Department of Professional and Occupational Regulation
- What size furnace does my house need?
- A contractor has to size it with a load calculation, not a quick rule of thumb. That calculation looks at your square footage, your insulation, your windows, and your ceiling height, because a furnace sized off square footage alone can end up too big or too small. Too big and it short cycles, heating fast then shutting off before the house evens out. Too small and it runs constantly through the cold stretch here without keeping up. Ask the contractor to walk you through the load calculation before they quote a size.
- How do I know it's time to replace my furnace?
- An aging furnace working harder than it used to is the first sign. Watch for rooms that used to heat evenly now having cold spots, a burner that cycles on and off more than it used to, or repair calls piling up in the same season. Homes here need heat from October through April, so a furnace on its way out will show these signs well before the coldest nights hit. Replacing it before it fails outright means you are not without heat when it drops to 29 degrees outside.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and what furnace you have now. Every new gas furnace sold today has to reach at least 80 percent AFUE by law, so the real choice is between that baseline and a higher-efficiency model above it. The higher efficiency unit costs more upfront, but with 7 months of heating season here, the difference in how much gas it burns adds up over the years you own it. A contractor can lay out the actual models and efficiencies available for your house so you are comparing real numbers, not estimates.