What we do
HVAC services engineered for the Sierra foothills
Residential and commercial heating, cooling and indoor-air work across Nevada County and Truckee/Tahoe. Forced air and hydronic, done by Foothill Air Systems.
Service directory
Everything we do, grouped by category
Ducted furnaces, air conditioners and heat pumps, installed to spec.
We are a Day & Night dealer, and it is the line we reach for when a house wants one central ducted system done properly — a gas furnace, an air conditioner, a heat pump or a matched pair. We size it to the house, install it to the manufacturer's spec, and commission it with the readings written down.
Day & Night System Services details- Day & Night gas furnace, air conditioner, heat pump and packaged-unit installation
- Matched furnace + AC and dual-fuel furnace + heat pump pairings
- Manual J load calculation rather than swapping like for like off the old nameplate
- Duct evaluation and static-pressure testing before the equipment is specified
- Line-set, condensate, venting and combustion-air work to code
- Commissioning with recorded airflow, temperature-rise and charge readings
- Thermostat and control setup, including dual-fuel changeover
- Ongoing maintenance and repair on Day & Night equipment, including units we did not install
Whole-home air filtration for wildfire smoke, dust and dry air.
Air quality is not an upsell in this region — it is a core part of the system. We build filtration, ventilation and humidity control into the equipment so that when the air outside is bad, the air inside is not.
Indoor Air Quality Services detailsRadiant floor heating, boiler service and snowmelt systems.
Radiant and hydronic heating is genuinely well suited to mountain homes, and it takes real craftsmanship to do correctly. We design, install, service and troubleshoot hydronic systems — in-floor radiant, panel radiators, hydronic air handlers and snowmelt.
Radiant & Hydronic Heating Services detailsRooftop unit service, repair and maintenance plans for businesses.
For commercial properties, HVAC is an operating requirement. We handle service, replacement and planned maintenance for offices, retail, restaurants, medical and light industrial spaces across Nevada County — with the scheduling discipline that keeps work from interrupting your business.
Commercial HVAC Services detailsFurnace, AC and heat pump replacement sized by a load calculation.
A replacement is the one chance to fix everything the old system got wrong. We start with a load calculation and a look at your ductwork — not a rule-of-thumb tonnage guess — then design a system around how your home actually loses and gains heat.
HVAC Replacement Services detailsCold-climate and dual-fuel systems for homes at elevation.
Modern cold-climate heat pumps are a legitimately better answer for much of Nevada County than they were a decade ago. They heat and cool with one system, run on electricity, and hold usable capacity far below freezing — but only if the model is chosen for our climate and commissioned correctly.
Heat Pump Services detailsMitsubishi ductless mini-splits and multi-zone systems.
Mitsubishi inverter systems solve problems that a single central system cannot: the room that is always cold, the addition with no duct path, the ADU or shop, the open great room with a wall of glass. We design, install and service them — including multi-zone systems that condition several spaces independently from one outdoor unit.
Mitsubishi System Services details- Single-zone and multi-zone inverter system design
- Wall-mount, ceiling-cassette, floor-mount and slim-ducted indoor units
- Ducted air handlers for whole-home zoned systems
- Additions, ADUs, converted garages, shops, studios and guest cabins
- Line-set routing planned for a clean exterior, not an afterthought
- Condensate management including pumps where gravity drainage is not available
- Controller, zoning and smart-thermostat integration
- Filter, coil and blower-wheel maintenance to keep rated performance
No-heat and no-cool repair for furnaces, heat pumps and AC.
When a system quits in the foothills it is rarely convenient. We diagnose the real root cause — not just the symptom that tripped the thermostat — explain what we found in plain language, and give you the repair options before any work starts.
HVAC Repair Services detailsThe Foothill Comfort Club
Maintenance is the cheapest thing you will ever do for an HVAC system. Members get scheduled precision tune-ups, priority when the schedule is full, and a documented service history that keeps manufacturer warranties intact — for less than most people spend on one emergency call.
Essential
$169
- One precision tune-up per year, timed to your primary season
- Full multi-point inspection with written findings
- Standard filter change at each visit
- Condensate line clearing and safety-control verification
- Priority scheduling ahead of non-members
- 10% discount on repairs
- Maintenance history kept on file for warranty claims
Preferred
$279
- Two precision tune-ups per year — heating in autumn, cooling in spring
- Everything in Essential, at both visits
- 15% discount on repairs
- Front-of-line priority scheduling, ahead of Essential members
- Static-pressure and airflow check at the heating visit
- Refrigerant charge verification at the cooling visit
- Annual written system-condition summary for planning
Premier
$389
- Two precision tune-ups per year, covering up to two systems
- Everything in Preferred
- No diagnostic fee on service calls
- 20% discount on repairs
- Highest scheduling priority of any tier
- Premium media filter included at each visit
- Hydronic and radiant system inspection included where applicable
- Whole-home humidifier and IAQ equipment service included
- Replacement credit: your membership dues applied toward a new system
No long-term contract — cancel any time
Membership travels with you if you move within our service area
Every visit performed by Foothill Air Systems, never subcontracted
Manufacturer warranty requirements documented and kept on file
Request service
Not sure which service you need?
Describe the symptom — a cold room, a rising bill, a system that will not start — and we will tell you what we would check first.
- Grass Valley, CA & Truckee/Tahoe
- Mon–Fri: 8AM–5PM
Sat: By Appointment
Send us the details
A technician reviews every request. No call centre.