Mill Valley sits at the foot of Mount Tamalpais, and its homes live in two climates. Houses under the redwoods and on steep, shaded lots stay cool and damp, and the heat runs most of the year; homes in the sunnier spots get warm afternoons that test an air conditioner. Many houses date from the early 1900s to the 1960s, with ducts in a crawlspace and little room for new equipment. Those three facts drive most of what we do in Mill Valley, zip code 94941.
Common calls in Mill Valley
| What you notice | Likely cause | Where to start |
|---|---|---|
| AC runs on a warm afternoon but the house stays hot | Dirty outdoor coil, failed capacitor or low refrigerant | AC repair in Mill Valley |
| Heat pump blows cool air in winter | Defrost fault, a sensor or low refrigerant | Heat pump repair in Mill Valley |
| Mini-split blinking or showing an error code | Sensor, drain or communication fault | Mini-split repair in Mill Valley |
| Furnace short-cycles or will not light | Dirty flame sensor, igniter, or overheating from a clogged filter | Furnace repair in Mill Valley |
| Musty smell when the heat comes on | Damp crawlspace air drawn into leaky ducts | Indoor air quality |
Heating most of the year
On a shaded lot the heat may run from fall through late spring and on many summer evenings too. That much running time wears out igniters, flame sensors and blower motors sooner and clogs filters faster. Heating repair in Mill Valley covers furnaces, boilers and heat pumps. When an older furnace is done, furnace installation in Mill Valley weighs a new furnace against a heat pump, with attention to tight crawlspace and closet access and to venting that has to suit the new unit.
Heat pumps and mini-splits in older homes
Long heating seasons with mild temperatures make heat pumps a sensible upgrade here, and in houses with no room for new ducts, a ductless system is often the simplest way to add heating and cooling. Mini-split installation in Mill Valley covers one room or several rooms on one outdoor unit, and heat pump installation starts with whether the existing ducts and electrical panel can support it.
Shaded, damp lots bring their own wear. Redwood needles and leaves pack outdoor coils, and units in cold, shaded spots go into defrost more often in winter. Clearing debris and checking the defrost controls is part of keeping a heat pump healthy here.
Cooling for the sunnier spots
Not every Mill Valley home needs air conditioning, but sunny exposures and upstairs rooms can get uncomfortable on warm afternoons. AC repair in Mill Valley handles systems that stop cooling, a spring AC tune-up in Mill Valley cleans the coil and the condensate drain before the first warm spell, and AC installation in Mill Valley compares central air with a heat pump or mini-splits, which heat as well.
Damp air and ducts
Crawlspace ducts in older homes come loose, lose their insulation and pull in damp air. Duct cleaning in Mill Valley helps after a remodel or when vents blow dust; for a musty house, finding disconnected or wet ducts and controlling humidity usually does more. In cooling mode a heat pump or mini-split also removes moisture, and many mini-splits have a dry mode for damp days.
Brands we service in Mill Valley
We are independent and work on all major brands. Trane owners can see Trane service in Mill Valley. There are also pages for Mitsubishi Electric, Daikin and Fujitsu ductless systems and for Carrier and Lennox equipment in Mill Valley homes.
Booking a visit
Same-day service is available with no overtime charges, and urgent problems such as no heat on a cold night are answered 24/7 through emergency HVAC in Mill Valley. Yearly HVAC maintenance keeps small problems from becoming those calls. You get the price after the diagnosis and before any work begins. We also serve Tiburon and Belvedere.