Fast, Reliable Heat Pump & Mini Split Across West Hills
Heat pump and mini-split service in West Hills typically runs $150–$650 for repairs and $3,500–$7,500 for full system installations, with most diagnostic calls completed same day. We’re Stonegate Heating & Air California, and we’ve been driving out to the western San Fernando Valley for 16 years — long enough to know that a system working fine in Canoga Park can struggle here where the Santa Susana Mountains trap heat like a bowl. If you’re in 91307 or 91308 and your heat pump is short-cycling or your mini-split is blowing warm, call us at (855) 467-1888. Jason Trent, our owner and field supervisor, still rides to West Hills calls personally.
Why Stonegate Heating & Air California Is West Hills’s Preferred Heat Pump & Mini Split Company
We’ve earned 499 verified reviews at a 4.7-star average across platforms — and a significant share of those come from West Hills homeowners who found us after other companies couldn’t diagnose their attic duct failures. They mention the same thing: Jason showed up, crawled into a 150°F attic, and found the real problem.
Our response time to West Hills averages under 90 minutes from dispatch because we stage technicians coming off Woodland Hills and Calabasas calls along the 101 corridor. That matters when your compressor is locked out on a 105°F Saturday afternoon and the house is climbing past 85 inside.
We also know the neighborhood split cold. West Hills has two distinct housing populations: the 1960s–80s ranch tracts on the valley floor with original ductwork, and the Woolsey Fire rebuild zones in the hills where new Title 24-compliant equipment was mandated. Our Heat Pump & Mini Split team handles both — but the approach is completely different.
Our Heat Pump & Mini Split Services in West Hills
Heat Pump Repair in West Hills
We repair heat pumps from all nine brands we service, including Carrier, Trane, and Lennox units common in West Hills’s older subdivisions. The most frequent call we get: system runs but can’t cool below 78°F. Usually it’s not the heat pump at all — it’s collapsed flex-duct in a 150°F attic, creating static pressure that makes the compressor work itself to death. We find that failure pattern far more here than in coastal zones. Repair runs $150–$650 depending on whether we’re replacing a capacitor or recovering refrigerant after a leak.
Heat Pump Installation in West Hills
New heat pump installation in West Hills demands careful load calculation because of that trapped valley heat. A system sized for a Reseda home will fall short here. We also run into space-constrained condenser pads on 1960s lots — too small for modern heat pump footprints, which restricts airflow and burns out compressors in two to three years if not addressed. Full installation with pad upgrade runs $3,500–$7,500. We handle Title 24 compliance documentation for permit pulls in LA County.
Mini Split Install in West Hills
Mini split installation is our fastest-growing request in West Hills, and it’s driven by attic duct failure. Homeowners get one or two quotes to replace collapsed ductwork, then call us to price a ductless alternative. On a Woolsey Fire rebuild near Valley Circle, we installed a multi-zone Daikin mini-split system because the original attic ducts had collapsed from years of 150°F+ attic heat. The homeowner chose ductless to avoid the cost of replacing every foot of ductwork. Single-zone mini splits start around $3,500; multi-zone systems run higher depending on line-set routing.
Mini Split Repair in West Hills
Ductless systems fail differently than ducted — refrigerant leaks at flare connections, failed inverter boards, and clogged condensate pumps from dust during Santa Ana wind events. We stock inverter boards and flare tools for major brands, so most mini split repairs in West Hills are same-day. Typical repair: $150–$650.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in West Hills
We’re certified to work on nine leading brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. That means whatever badge is on your outdoor unit, we don’t need to subcontract or order parts from three states away. For West Hills customers, we maintain local inventory of common Carrier and Trane heat pump components — compressors, contactors, capacitors — because those brands dominate the 1970s–90s installs in this neighborhood. Faster parts means faster fixes, and on a 105°F day in the 91307 ZIP, that difference matters.
Common Heat Pump & Mini Split Problems We See in West Hills Homes
- Collapsed attic flex-duct from extreme heat. Attics in West Hills’s older ranch homes routinely exceed 150°F in July, destroying duct mastic and collapsing flex-duct liners. A technician should expect to find duct systems that look intact from the access panel but are essentially open to the attic once you get a few feet in — a failure mode far more common here than in cooler coastal service areas.
- Undersized condenser pads restricting airflow. The 1960s lots in West Hills were never designed for modern heat pump footprints. Condensers squeezed against fences or walls run hot, cycle excessively, and burn out compressors well before their rated lifespan.
- Short-cycling from high static pressure. When attic ducts collapse partially, the system can’t move designed airflow. The heat pump hits high-pressure limits and shuts off, restarts, shuts off again. Homeowners think it’s a thermostat problem; it’s almost always duct destruction.
- Mismatched equipment in fire-rebuilt homes. New Title 24-compliant heat pumps installed in Woolsey Fire rebuilds are sometimes paired with pre-existing, uninsulated ranch ductwork. The equipment is efficient; the delivery system isn’t. Result: insufficient heating and cooling in extreme weather, and homeowners who blame the heat pump when it’s the ducts.
Pricing for Heat Pump & Mini Split in West Hills, CA
Here’s what we charge for the most common calls in the 91307 and 91308 ZIP codes:
| Service | Price Range in West Hills |
|---|---|
| Heat Pump / AC Repair | $150 – $650 |
| Heat Pump / AC Installation | $3,500 – $7,500 |
| Tune-Up & Preventive Maintenance | $80 – $200 |
| Mini Split Installation (single-zone) | $3,500 – $5,500 |
| Mini Split Installation (multi-zone) | $5,500 – $7,500+ |
Installation costs vary with electrical panel capacity, line-set length, and whether we need to upgrade your condenser pad or add a dedicated circuit. We don’t quote over the phone for installs — we measure, we test, we give you a written estimate. Estimates are free. Call (855) 467-1888 to schedule.
We Also Serve Cities Near West Hills
Our service radius covers the full western San Fernando Valley corridor. We run heat pump and mini-split calls daily in Canoga Park, Woodland Hills, Calabasas, and Chatsworth — often routing technicians between these cities to keep response times tight. If you’re on the border of West Hills and Woodland Hills near Mulholland, you’re in our zone.
Serving West Hills, CA — Our Local Coverage Area
We’re based in the West Hills area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs — Heat Pump & Mini Split in West Hills
Because replacing every foot of collapsed flex-duct in a 150°F attic often costs more than going ductless, and the new ducts will fail the same way in five to seven years. Mini-splits bypass the attic entirely, delivering conditioned air directly where it’s needed. We’ve done dozens of these conversions in the ranch tracts near Fallbrook Avenue — call (855) 467-1888 for a free comparison estimate.
Modern inverter-driven heat pumps handle 105°F+ days without issue, but only if sized correctly for West Hills’s actual cooling load. The trapped valley heat here adds 15–22°F over coastal LA, so a system sized by square footage alone will fall short. We run Manual J load calculations that account for your home’s orientation, insulation, and duct condition. If your current system can’t cool below 78°F on the hottest days, it’s likely undersized or suffering duct collapse.
Fire-rebuilt homes in West Hills typically have new Title 24-compliant equipment with stricter duct-leakage standards, but some rebuilds reused existing duct paths. You need a technician who understands both the new code requirements and the legacy infrastructure. We’ve serviced both — the all-new installs in the hills and the hybrid jobs where new heat pumps were paired with old ducts. Jason Trent evaluates each rebuild job personally to catch mismatches.
Sometimes, but R-22 refrigerant phaseout makes major repairs on pre-2010 units economically questionable. If your 20-year-old heat pump needs a compressor or coil replacement, you’re looking at $1,500+ in repairs on equipment with no future refrigerant supply. We give honest assessments — we’ll fix it if it makes sense, but we won’t take your money for a temporary patch when replacement is the smarter call. Estimates are free.
That gasping or whistling is high static pressure from collapsed or disconnected ductwork in your attic. In West Hills, we see this constantly — flex-duct that looks fine at the plenum has separated or collapsed three feet in, so your system is trying to pull return air through a pinhole. The sound is your blower motor straining. Left unaddressed, it will burn out the blower or the compressor. We find and fix these with attic inspections that most companies skip.
Written by Jason Trent, Owner and Field Supervisor at Stonegate Heating & Air California, serving West Hills and the western San Fernando Valley since 2008.