The short answer
ReliableAir HVAC Services serves Lexington Hills, about 18 miles south of San Jose in Santa Clara County. We repair and install furnaces, heat pumps, mini-splits and AC, and provide tune-ups, duct cleaning and air quality service for hill homes.
Up in Lexington Hills, about 18 miles south of San Jose in unincorporated Santa Clara County, comfort problems tend to be about heat first and cooling second. Elevation, tree cover and winding roads shape how houses are built, how equipment is reached and how long a system has to run on a winter night. ReliableAir HVAC Services repairs and installs furnaces, heat pumps, ductless mini-splits and air conditioners for hill homes, and handles the maintenance, duct cleaning and indoor air quality work that keeps them running through the year.
Winter is the hard season in the hills
The Santa Clara Valley's winters are mild and damp, but higher ground stays colder for longer, and a heating system in the hills simply works more hours than one on the valley floor. That extra runtime wears on igniters, blower motors, inducer fans and flame sensors. It also exposes duct leaks: a furnace that keeps a small house warm in town can lose the battle if half its output escapes into a cold crawlspace.
Our heating repairs here usually start with a full combustion and airflow check, because the first visible symptom is rarely the actual cause. A furnace that short-cycles may have a dirty sensor, a clogged filter, an oversized burner setting or a blocked vent, and each calls for a different fix.
- Igniter glows but burners never light
- Blower runs constantly with lukewarm air
- Furnace locks out and needs a reset every few days
- Rooms farthest from the furnace stay cold
Equipment access on a hillside lot
Hill homes put equipment in creative places: under decks, in low crawlspaces, on narrow side yards, in attics reached through closets. We ask about access before we arrive so the technician brings the right ladders, lighting and tools. For installations, placement matters as much as the equipment itself. An outdoor unit needs solid footing, clearance from brush and debris, and a spot where service is possible without crawling through mud.
If your current system sits somewhere nearly impossible to reach, replacement time is a good chance to move it. We will talk through what is practical for the structure and what it would involve.
Heat pumps, mini-splits and the furnace question
Bay Area Air District Rule 9-4 sets a zero-NOx emission standard for natural gas furnaces manufactured from 2029. In practice that steers homeowners toward heat pumps when a furnace is replaced after that date. The rule does not require removing a furnace that still works, so nobody in Lexington Hills needs to rush.
For homes planning ahead, a heat pump can deliver both heating and cooling from one outdoor unit. Where ducts are poor or missing, a ductless mini-split lets each room or wing run independently, which suits additions, converted garages and upstairs spaces that never felt connected to the main system. We calculate heating load for the actual house, including its exposure and insulation, rather than guessing from square footage.
Warm summer days and smoky air
Southern and inland parts of the valley run noticeably hotter in summer than areas near the Bay, and sunny slopes can heat up fast in the afternoon. Air conditioners and heat pumps that sat idle all winter often reveal a weak capacitor or low refrigerant on the first hot day, so a spring check pays off.
Dry seasons can also bring smoke and dust into the hills. Better filtration, sealed return ducts and a tight filter rack all help keep that outside air from circulating through the house. We can review your current setup and suggest changes that suit the system you have.
A yearly routine that fits mountain living
Since a breakdown in the hills means a longer wait for parts and a colder house in the meantime, preventive care matters more here than almost anywhere else we work. We recommend one full visit each fall, before the furnace or heat pump starts carrying the load, plus a short look at the cooling side in late spring if you rely on air conditioning.
During that fall visit the technician tests safety controls, measures temperature rise across the furnace, checks gas pressure or heat pump defrost operation, and inspects the vent pipe for gaps or animal nests. Outdoors, we clear needles and leaves from the coil and confirm the pad has not shifted on the slope. Small findings get handled while we are there, and anything bigger gets explained with options rather than pressure.
- Change or wash filters more often during smoky or dusty months
- Keep brush trimmed back a couple of feet from outdoor units
- Check that crawlspace vents and access doors close properly
- Test carbon monoxide alarms when you change the clocks