Furnace Installation in Morgan Hill & the South Bay
A free estimate with real numbers, equipment sized to your house, and a three-year labor warranty on the install.
Licensed & insured, CA CSLB #935704 · All brands · Financing available
We answer 24/7 (408) 497-0444
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Replace It Once, Correctly
A furnace is a 15-to-20-year decision, and install quality matters as much as the equipment. Wrong sizing, sloppy venting, or leaky duct connections quietly tax every heating bill for two decades, and ductwork is no side issue for us: it’s our second-biggest repair category, so we’ve seen exactly how bad connections age. We size to the house, seal the connections, and verify combustion before we leave. That last part is what our NCI Combustion Analyst certification is for.
Real numbers from our own installs: typically $1,683 to $10,392 installed, with most systems landing at 3 or 4 tons. We’re a Trane TCS Select dealer, and Trane is what we install most, with Day & Night next. Worth knowing before you buy: under Bay Area Air District Rule 9-4, gas furnaces manufactured after January 1, 2029 must meet a zero-NOx standard, so we’ll give you an honest heat pump comparison, rebates included, before you commit either way.
How to Know It’s Replacement Time
15-20+ years old
Furnaces at this age are past their design life. Replacing on your schedule beats replacing during the December to January rush, when our no-heat calls peak.
A cracked heat exchanger
This is the repair that usually isn’t worth making. It’s a safety issue and a big-ticket part on an old system.
Repeat repairs
When annual repair bills rival a payment on new equipment, the math has flipped.
Rising bills, uneven heat
Old single-stage furnaces waste fuel. Modern high-AFUE equipment heats more evenly for less.
What a Modern Air Install Includes
Free written estimate
Load calculation and an itemized quote, typically $1,683 to $10,392 installed. We’ll run a furnace-vs-heat-pump comparison if you want it.
Combustion-tested handoff
NCI-certified combustion analysis before we leave. 3-year labor warranty plus the manufacturer’s.
Wisetack financing
Monthly payments on qualifying installations.
What an installation looks like
Free in-home estimate
A real load calculation on your house and a written, itemized quote. No expiring "today only" pricing.
Install day
Most straightforward replacements finish in a day. We protect floors, haul away the old equipment, and test before handoff.
Commissioned and warrantied
Verified running to spec, walked through with you, backed by a three-year labor warranty.
All Major HVAC Brands
What South Bay Customers Say
“Outstanding crew who installed the Trane HVAC system. Highly recommended company.”
Robert B.Morgan Hill · System installation“I recently had Modern Air install a new HVAC system in my home, and I couldn’t be more pleased with the experience. From start to finish, the team was professional, accommodating, and timely. They clearly communicated each step of the process, arrived on schedule, and worked efficiently to complete the installation.”
Kris C.System installation“Always very professional and high quality work. Fair prices. Highly recommended.”
Jeff Z.System installationWhere to Go From Here
Furnace Repair
Furnaces are the single biggest repair category in our job log.
Furnace Maintenance
A fall tune-up that checks safety first: heat exchanger, combustion, and carbon monoxide.
All heating services
The full heating lineup, with pricing and what to expect.
HVAC financing via Wisetack
Monthly payments on qualifying installations, approved in minutes.
Frequently Asked Questions
How much does a new furnace cost installed?
From our own installs: typical full replacements run between $1,683 and $10,392 depending on size and scope. The in-home estimate is free and itemized.
Should I replace my furnace with a heat pump?
Sometimes, yes. Bay Area rules are tightening on gas equipment, and rebates favor heat pumps. We’ll show you both sets of numbers honestly and install whichever fits your house and budget.
How long does furnace installation take?
Usually one day for a like-for-like swap. Venting, gas line, or duct modifications can add time.
Which brands do you install?
We’re a Trane TCS Select dealer, and Trane is the brand we install most. We also install Day & Night, Lennox, and Bryant. No online-purchased units; the warranties aren’t honored.
What warranty comes with the install?
Three years on labor plus the manufacturer’s equipment warranty, with combustion verified before handoff.
Get Your Free Replacement Estimate
A real load calculation, a written quote with real numbers, and no pressure to sign anything on the spot.
Call or Text (408) 497-0444