Heating and air conditioning service in Bennett Valley, Santa Rosa

Why upstairs rooms run hot in Bennett Valley's 2-story homes

Heat rises, the upstairs sits under a sun-baked roof, and in many 2-story homes from this era one furnace and one AC serve both floors from a single thermostat downstairs. When that thermostat is satisfied, the system shuts off, even if the bedrooms upstairs are still 5 or more degrees warmer. In winter it flips: the upstairs is comfortable and the downstairs, especially rooms over a garage or slab, runs cool.

The ductwork often makes it worse. Systems from the 1970s and 1980s commonly have a single central return, usually downstairs, and upstairs supply runs that are long, cross the attic, and have leaked for decades. The upstairs bedrooms get the least air and the hottest air.

For a Bennett Valley homeowner, the fix is usually about where the air goes. A bigger air conditioner just makes the downstairs colder and the system cycle faster.

Fixes for uneven upstairs and downstairs temperatures

From least to most involved:

1. Run the fan on "On" or "Circulate" in summer, so air keeps mixing between floors.
2. Balance the dampers in the supply ducts, moving more air upstairs in summer and adjusting for winter.
3. Seal and repair the upstairs duct runs through the attic, and fix crushed or disconnected flex duct.
4. Add an upstairs return, so hot air from the second floor actually gets pulled back to the system.
5. Improve attic insulation and ventilation to cut the heat coming down through the ceiling.
6. Switch to 2-stage or variable-speed equipment when replacement time comes. Longer, gentler run cycles even out temperatures.
7. Add zoning, with motorized dampers and a thermostat on each floor, or a separate system for the upstairs.
8. Add a ductless mini-split for one problem room, such as a bonus room over the garage, instead of reworking the whole system.

The right answer depends on what's actually happening, so diagnosis starts with measuring temperatures and airflow room by room and looking at the duct layout in the attic.

Heating and AC services in Bennett Valley

As a local HVAC company in Santa Rosa, we handle the whole range of work Bennett Valley homes need: AC repair, furnace repair, seasonal tune-ups, duct repair and balancing, and system replacement sized from a proper load calculation, including heat pump conversions. Emergency calls are answered 24/7.

Trees, yards, and your outdoor AC unit

Bennett Valley has a lot of mature trees, including oaks, close to houses. Shade over the outdoor unit is fine and can help a little.

Leaves, acorns, and spring catkins falling into the top of the unit are not. Clear the top grille and the base of the cabinet in fall and spring, keep shrubs 2 feet back, and make sure sprinklers aren't spraying the coil, since mineral deposits build up on the fins.

HVAC service near Bennett Valley

We also serve Rincon Valley to the northeast, Montgomery Village to the north, and the rest of central and southeast Santa Rosa. Bennett Valley addresses are in ZIP codes 95404 and 95405.

Bennett Valley HVAC questions