Cost of furnace replacement in New Mexico (NM)
A 80,000 BTU furnace installed
$4,800to $7,200
That is a standard 80% AFUE model, the federal minimum and what most replacements are. A 96% condensing furnace runs $5,800 to $8,800.
Is the efficient one worth it here?
Costs more
$1,300
Saves a year
$169
Pays back in
7.7 yrs
New Mexico burns enough gas over a winter for the efficiency to earn its premium back well inside the furnace's life. At $1.27 a therm and 4,200 heating degree days, the condensing model is the better buy.
Before you replace like for like
A furnace is not the only option. A heat pump does the same job using electricity, and in some states costs less to run — it depends on the gap between gas and electricity prices where you live, which is not the same everywhere.
Compare both in New MexicoCommon questions
How much does it cost to replace a furnace in New Mexico?
Between about $4,800 and $7,200 installed for a standard 80% AFUE furnace, or $5,800 to $8,800 for a 96% condensing model. A 1,800 square foot home in New Mexico needs roughly 80,000 BTU of output.
Is a high-efficiency furnace worth it in New Mexico?
Yes. The condensing model costs about $1,300 more and saves roughly $169 a year on gas at New Mexico prices, so it repays itself in about 7.7 years — well inside the life of the furnace.
What size furnace do I need?
About 80,000 BTU for 1,800 square feet in New Mexico's climate — roughly 44 BTU per square foot, which reflects 4,200 heating degree days a year. Colder states need more output for the same house.
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Sizing from New Mexico's heating degree days for a 1,800 square foot home. Gas price from the US Energy Information Administration, 2026-07. Installed costs are a national estimate spread ±20% — ductwork, venting runs and your region move real quotes more than the furnace itself does. Get three.