Furnace Replacement in Palo Alto, done with the future in mind
Most Palo Alto furnaces were installed decades ago, in attics, closets and crawlspaces. When yours is ready to go, the smart question is not just which furnace, but whether to replace it with a heat pump instead.
Call 650-460-3483438 Cambridge Ave, 94306
Furnace replacement in Palo Alto usually comes down to two paths: a new high-efficiency gas furnace, or a heat pump that replaces both the furnace and the air conditioner. City of Palo Alto Utilities offers a $2,500 rebate ($5,000 income-eligible) when a heat pump replaces a gas furnace, and Bay Area rules set a zero-NOx standard for furnaces manufactured after January 1, 2029. ComfortFlow HVAC Palo Alto prices both options side by side.
Palo Alto’s furnaces are getting old
Palo Alto’s population more than doubled after World War II, from about 25,000 to 55,000 by 1960, as Joseph Eichler and other builders filled the south side with new subdivisions and the Stanford Industrial Park opened. Most of those homes, and the older houses around University Avenue and in Old Palo Alto, are now on their second, third or fourth furnace. Many of today’s units sit in tight attics, hall closets and crawlspaces that were never designed for modern equipment.
When a furnace reaches 15 to 20 years old, or needs a major repair like a heat exchanger, replacement makes sense. The question is what to replace it with.
Gas furnace or heat pump?
| New gas furnace | Heat pump | |
|---|---|---|
| Heating | Yes | Yes |
| Cooling | Needs separate AC | Yes, same system |
| Fuel | CPAU gas | CPAU carbon-neutral electricity |
| CPAU rebate | None | $2,500, or $5,000 income-eligible |
| Combustion indoors | Yes, needs venting and CO checks | No |
| 2029 Bay Area rule | Zero-NOx standard applies to furnaces manufactured after Jan 1, 2029 | Not affected |
| Best fit | Rare cases where electrical capacity cannot be added | Most Palo Alto homes |
Palo Alto’s average January low is about 40°F, well inside the range where modern variable-speed heat pumps run efficiently. That is why most furnace replacements we design here end up as heat pumps, often with the existing ducts sealed and reused.
When a gas furnace still makes sense
A like-for-like gas furnace can be the right call when a home cannot add electrical capacity without a major service upgrade, or when a homeowner plans to sell soon and wants the lowest upfront cost. We will price it honestly. Just know that it will not qualify for CPAU rebates, still needs a separate air conditioner for cooling, and new furnaces manufactured after January 1, 2029 must meet the Bay Area’s zero-NOx standard.
What a proper replacement includes
- A room-by-room load calculation, because many older Palo Alto furnaces were oversized
- A duct inspection, with sealing where crawlspace or attic runs leak
- Correct venting removal or capping when gas equipment is retired
- Electrical planning for a heat pump, including circuit splitters to avoid panel upgrades where possible
- Commissioning: refrigerant charge, airflow and temperature rise verified
- The City permit and, for heat pumps, CPAU rebate paperwork within 90 days of final inspection
Why ComfortFlow HVAC Palo Alto
ComfortFlow HVAC Palo Alto has replaced and serviced heating systems in Palo Alto for over 10 years, from Professorville shingle houses to Midtown ranches. We show you both paths, explain the trade-offs in plain language, and never push a replacement when a repair is the better value. See also furnace repair and heat pump installation.
Furnace Replacement, step by step
- AssessAge, condition, ducts, venting and panel.
- CompareGas furnace vs. heat pump, with rebates priced in.
- ReplaceClean install, duct sealing, commissioning.
- Close outFinal inspection and rebate paperwork.
Often paired with furnace replacement
Furnace Replacement across Palo Alto and nearby
We’re based at 438 Cambridge Ave and work in every Palo Alto neighborhood. Local notes for each area:
New to us? Start with our overview of HVAC in Palo Alto.
Furnace Replacement questions,
answered.
Answers from the ComfortFlow HVAC Palo Alto team about furnace replacement in Palo Alto homes.
How do I know my furnace needs replacing?
Common signs are age over 15 to 20 years, a cracked heat exchanger, frequent repairs, uneven heating, rising bills or a carbon monoxide alarm. If a repair costs a large share of a new system, replacement usually makes more sense. ComfortFlow HVAC Palo Alto always quotes the repair first and only recommends replacement when the numbers support it, with the CPAU heat pump rebate included so you see the real comparison.
Can I still install a new gas furnace in Palo Alto?
Yes, you can replace a gas furnace today. Keep in mind that the Bay Area Air District’s zero-NOx standard applies to furnaces manufactured after January 1, 2029, and that a gas furnace does not qualify for the CPAU Heat Pump HVAC rebate. Palo Alto’s climate plan also aims to largely eliminate gas use in single-family homes, so most homeowners replacing a furnace now choose a heat pump.
Will a heat pump heat as well as my furnace?
In Palo Alto, yes. Average January lows are about 40°F and the record low is 20°F, both well within the operating range of modern variable-speed heat pumps. Heat pumps deliver steadier, gentler warmth over longer cycles instead of short blasts of very hot air. With proper sizing, sealed ducts and a thermostat set up for heat pumps, most homeowners find them more comfortable.
Can I keep my existing ducts?
Often, yes. We test static pressure and airflow, then seal leaks and resize only the runs that need it. Heat pumps move more air at lower temperatures than gas furnaces, so duct problems you never noticed can show up as weak airflow. Fixing them during the replacement is far easier than going back later.
How long does a furnace replacement take?
A straightforward furnace-to-furnace swap usually takes one day. A furnace-to-heat-pump conversion typically takes one to two days, plus any electrical work. Qualifying heat pump projects can use the City’s instant permit, so there is no plan review wait. We schedule the final inspection promptly so your CPAU rebate application can go in.
Let’s make home
feel better.
Tell ComfortFlow HVAC Palo Alto what’s happening with your heating or cooling, and we’ll start with the right questions. Serving Palo Alto, Menlo Park, Mountain View, Los Altos, Stanford and the Peninsula.