Heating & Cooling for Old Palo Alto’s Classic Homes
Spanish Revival, Tudor and Colonial homes with deep lots and mature trees. Beautiful houses, often with heating systems added decades after they were built. We make them comfortable without compromising what makes them special.
Call 650-460-3483438 Cambridge Ave, 94306
Old Palo Alto homes, mostly built in the 1920s and 1930s between Embarcadero Road and Oregon Expressway, often have heating and cooling added long after construction. ComfortFlow HVAC Palo Alto upgrades these homes with properly sized heat pumps, repairs aging attic and crawlspace ductwork, and adds ductless zones for second floors, all with City permits and CPAU rebate paperwork handled.
Old Palo Alto is where many people picture “classic Palo Alto”: tree-lined streets, generous lots and architect-designed homes from the 1920s and 1930s. The comfort challenge here isn’t the climate. It’s the houses. Plaster walls, original windows, finished basements and second stories with limited attic space mean heating and cooling has to be planned around the architecture rather than the other way around.
What we see in Old Palo Alto homes
Many homes here started with a gravity furnace or floor furnace and picked up forced air in a later remodel. The result is often a capable furnace connected to a duct system that wasn’t really designed for it: long runs to the far side of the house, small returns, and second-floor rooms that run warm all summer.
- Second floors that overheat. Limited attic space above upstairs bedrooms makes ducting difficult. A ducted mini-split in the attic or wall-mounted heads often solve it.
- Basement and crawlspace equipment. Furnaces tucked under the house need clear access, good venting and sealed ducts to avoid pulling musty air.
- Big electrical loads. Remodeled kitchens, EV chargers and new heat pumps can push an older panel. We check capacity early and look at circuit splitters or a panel upgrade that qualifies for a CPAU add-on rebate.
- Outdoor placement. Deep side yards help with the City’s setback rules for heat pumps, but placement still needs to keep units out of view from the street.
What Old Palo Alto homes ask us for most
A Old Palo Alto
homeowner checklist
Five things that make the first conversation faster and the recommendation more accurate.
- Note which upstairs rooms run warm on summer afternoons
- Find your furnace age on the data plate (attic, basement or closet)
- Check your electrical panel amperage before planning a heat pump
- Look at side yards for a spot hidden from the street
- Keep plaster and trim concerns on the list for the walkthrough
Old Palo Alto
HVAC questions.
Answers specific to Old Palo Alto homes.
Can you add central air to an Old Palo Alto home without ducts?
Often, yes. Ducted mini-split air handlers fit in limited attic space, and wall or ceiling heads can cover rooms that ducts can’t reach. We’ll tell you which approach does the least damage to plaster and trim.
Will a heat pump keep a large older home warm?
Yes, when it’s sized with a real load calculation. Older homes with original windows lose more heat, and sizing accounts for that. Many large homes use two systems, one per floor.
Does my home need a panel upgrade for a heat pump?
Not always. Many Old Palo Alto homes have had service upgrades already. If yours hasn’t, CPAU offers an add-on rebate for a qualifying panel upgrade paired with a heat pump.
Are there historic restrictions on outdoor units?
Placement rules apply citywide: the City’s heat pump instant permit requires units off the roof and out of view from the public right of way. Homes with historic designations may face additional review, which we help you navigate.
How far are you from Old Palo Alto?
Our shop at 438 Cambridge Ave is just across Oregon Expressway, a few minutes from most Old Palo Alto streets.
Do you work in basements and crawlspaces?
Yes. A lot of the equipment and ductwork in this neighborhood lives under the house, and we plan access and protection carefully.
Also serving near Old Palo Alto
ComfortFlow is headquartered in Palo Alto. Read our main HVAC Palo Alto page for an overview of everything we do.
Comfort for your
Old Palo Alto home.
Tell us what’s happening with your heating or cooling, and we’ll start with the right questions.