Furnace Installation in Las Cruces, NM
A new furnace here will run from November through April every year. Tell us about the house, and a licensed contractor who covers Doña Ana County will get in touch.
Tell us about the job
It takes about a minute.
What a Las Cruces winter asks of a furnace
Homes here need heat from November through April, six months of the year, with winter nights averaging 30°F. A new furnace has to hold up through that stretch every year it's in the ground.
Most homes in the area heat with gas, and any non-weatherized gas furnace built since November 2015 has to reach at least 80 percent AFUE by federal rule. Power isn't guaranteed either. Across New Mexico, 13% of households lost power for 24 hours or more in 2024, and the region has logged 83 damaging wind events and 5 winter storms over the past ten years. Whatever furnace goes in should be able to come back on its own once the power does.
- 6 months
- November through April, your furnace is on duty
- 30°F
- the average winter night it heats against
- 61%
- of homes here heat with gas, so most furnaces here burn gas
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
A high-efficiency gas furnace would save about $40 a year to run in Doña Ana County compared with a gas furnace.
Estimates for a typical Doña Ana County home, from EIA household energy data, New Mexico fuel prices and NOAA climate normals. Your home will differ.
New Mexico requires HVAC contractors to hold a state license.
The license comes from the state's Construction Industries Division, and it belongs to the contractor, not to any single job. That means the same license covers this furnace install and the next one, so what the state tested and put on record is the person or company doing the work, not the paperwork for your address.
For a furnace install, that license is the thing standing behind the work. On top of it, Doña Ana County will need a permit for a furnace replacement, and an inspector checks the work once it's done, including the gas connection, which is the part that matters most if it's done wrong. Gas heat is how most homes here get warm, close to six in ten, so that inspection is not a formality this county skips.
Source: New Mexico Regulation and Licensing Department
- What size furnace does my house need?
- It depends on your square footage, your insulation, your ceiling height, and how many windows you have, so there's no single number that fits every house. A contractor works this out with a load calculation, which looks at your whole house rather than guessing off square footage alone. Going too big wastes fuel and cycles the furnace on and off more than it should. Going too small leaves you cold on the nights that drop to 30 degrees, which is a normal winter low here.
- How do I know it's time to replace my furnace?
- Watch for repairs that keep coming back, a furnace that can't hold the house at temperature, or one that's old enough that parts are getting hard to find. If yours is a standard model, anything built after November 2015 has to meet 80 percent AFUE at minimum, and if yours is well below that, a newer unit will get more heat out of the same fuel. Since homes here need heat from November through April, six months of the year, a furnace that's struggling matters more here than somewhere with a short winter. A contractor can look at the specific unit and tell you whether it's worth fixing again or replacing.
- Is a high-efficiency furnace worth it?
- It depends on how much you run your furnace and how old the one you have now is. With six months of heating season here, a furnace that's more efficient has more months to make up the difference than it would somewhere with a shorter winter. Most homes in Doña Ana County already heat with gas, so the comparison is usually old gas furnace against new gas furnace rather than switching fuels. A contractor can tell you what efficiency level makes sense for your house and your current unit.