Furnace Installation in Blacksburg, VA
A new furnace here will run from October through May every year. Tell us about the house, and a licensed contractor who covers Montgomery County will get in touch.
Tell us about the job
It takes about a minute.
Eight months of heat, and winters that test the power grid
Furnaces in Blacksburg run October through May. That's eight months of the year, with winter nights averaging 26°F from December through February. A new furnace has to hold up to a long season of hard use, not just a few cold snaps.
Most homes here heat with electricity, and the power doesn't always stay on. Virginia saw 22% of households lose power for 24 hours or more in 2024, and the region has logged 18 winter storms and 94 damaging wind events over the past ten years. Any furnace installed today, gas or electric, also has to meet the federal minimum of 80.0 percent AFUE if it's a non-weatherized gas model.
- 8 months
- October through May, your furnace is on duty
- 26°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 license sits with the contractor, not with any one job, so it is Virginia's record that this contractor has been tested and can be traced if the work goes wrong. Virginia does carve out an exception for small jobs, work under $1,000 does not need a licensed contractor, but a furnace installation runs well past that line, so the license requirement applies here.
A furnace install also runs gas connections, and a bad connection is the dangerous part of the job. In most cities and counties, replacing a furnace needs a permit from the local building office and an inspection once the work is done, and that inspection is what checks the gas connections on this particular job rather than the contractor's standing. Between the two, the license says who is allowed to do the work and the inspection says whether this job was done right.
Sources: Virginia General Assembly · Virginia Department of Professional and Occupational Regulation
- What size furnace does my house need?
- There's no fixed answer without a load calculation, and that's the only way to get it right. A contractor measures your square footage, your windows, your insulation, and how the rooms are laid out, then runs those numbers to find the size your house actually needs. Guessing based on your old furnace's size doesn't work either, since it may have been wrong from the start. Too big and the furnace short cycles, wearing out parts faster. Too small and it runs constantly trying to keep up, especially on nights near 26°F.
- How do I know it's time to replace my furnace?
- Watch for repairs that keep coming back, uneven heat between rooms, or a furnace that's running most of the 8 months a year you need heat here. An older furnace works harder to do the same job it used to, even before it fails outright. If the heat exchanger is cracked, that's not a repair, that's a replacement, since it's a safety issue. A contractor can tell you honestly whether what you're seeing is worth fixing or whether you're better off replacing it before it fails on a cold night.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and how much the furnace runs, and here that's 8 months a year. Any furnace made after November 2015 already has to hit 80 percent AFUE at minimum, so the real question is whether to go higher than that baseline. A high-efficiency model costs more upfront, and a contractor can walk you through what that difference looks like for your house. With winter lows averaging 26°F, a furnace here is doing real work most nights, so the extra efficiency has more chance to matter than it would somewhere milder.