Furnace & heating
AC repair
Ductless mini splits
TraneSeasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
Get your free estimateHVAC Company in Altadena, CA
Altadena isn’t a one-size-fits-all HVAC market. We work on 1920s bungalows with crawl spaces, 1950s ranchers on slab foundations, and newer foothill estates with multi-zone systems, and each one presents different ductwork, electrical, and equipment-siting realities. Add in Santa Ana wind events and wildfire smoke seasons, and the work here leans heavily toward sealed ductwork, high-efficiency filtration, and cooling that holds up in dry, triple-digit heat. Dalton Heating & Air handles all of it with written pricing, factory-trained technicians, and a full-year written guarantee on every repair. Call (626) 657-5344 any hour, any day.
Why Altadena Homes Are Different
The housing stock in Altadena spans a century of construction methods, and that range changes the job every time. Homes built in the 1920s and 1930s, especially Spanish colonials and craftsman bungalows, often have no return-air pathways designed for modern cooling loads and little to no wall insulation. The 1950s and 1960s ranch homes are frequently built on slab foundations, which means there is no attic or basement to run new ductwork through. On the west side of Lake Avenue, many of those mid-century tract homes were built with radiant floor heating and no central cooling at all. When those homeowners ask about adding AC, we are usually talking about mini-split or high-velocity systems, because the attic space is minimal and traditional duct runs are not feasible without major work.
The climate creates the second set of constraints. Altadena sits at the base of the San Gabriel Mountains, which means hot, dry summers with occasional Santa Ana events that push temperatures up while dropping humidity into the single digits. Those same wind events carry smoke and particulate from wildfire season, so filtration is not an afterthought here, it is the difference between a comfortable home and one that smells like a campground in October. Single-pane windows and older electrical panels are common across the older housing stock, and both need to be addressed before a high-efficiency system can perform the way it should.
Styles & brands we work with
Our Main Altadena Services
The three calls we get most often in Altadena are air conditioning repair during the summer heat, furnace repair when the rare cold snap hits the foothills, and heat pump installation for homeowners replacing aging equipment or adding cooling to homes that never had it. Each service has its own dedicated page with pricing and detail.
AC Repair in Altadena
When the Santa Anas push temperatures over 100 degrees, a failed condenser or a refrigerant leak stops being an inconvenience and becomes a health issue, especially for older residents and households with young children. We diagnose the problem, put the repair price in writing before any work begins, and stock common parts for Carrier, Trane, Lennox, and Goodman systems so most Altadena repair calls are resolved in one visit. AC Repair in Altadena covers the specific failures we see most often in this area and what repairs cost.
Heat Pump Installation in Altadena
Heat pumps make particular sense in Altadena because they handle both cooling and heating in one unit, which suits homes where a conventional furnace was never installed or where a mid-century radiant system left no ductwork to build on. Installing one on an older Altadena home often requires an electrical panel upgrade and a careful equipment-siting choice, since slab foundations and tight side yards limit where an outdoor unit can go. Heat Pump Installation in Altadena explains the process, the equipment options, and what a fixed written quote includes.
Furnace Repair in Altadena
Altadena winters are mild, but the foothill nights get cold enough that a failed furnace becomes the only thing anyone thinks about until it is fixed. The furnaces in this city are often original to mid-century homes, which means cracked heat exchangers, failed ignition systems, and aging blower motors are all routine repair calls. Every repair is guaranteed in writing for a full year, and if the work fails in that window, we return at no charge. Furnace Repair in Altadena details what we check, what repairs cost, and how we handle emergency calls.
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.
Brands We Service in Altadena
Our technicians are factory-trained on nine major residential brands, including Carrier, Trane, Lennox, and Goodman. We keep common parts stocked locally so most Altadena repair calls are completed same-day rather than waiting on a warehouse shipment. See our brands for the full list and training details.
See the difference
Before
After
Before
After
Before
AfterPricing for HVAC Company in Altadena, CA
| Service | Typical range in Altadena |
|---|---|
| AC repair | $150 – $650 |
| Furnace repair | $150 – $700 |
| AC installation | $3,500 – $7,500 |
| Tune-up | $80 – $200 |
What pushes a job toward the high end in Altadena is usually the age of the home: older electrical panels that need upgrading, single-pane windows that increase cooling load, and tight equipment-siting situations all add scope. Whatever the job turns out to be, the price is in writing before any work starts, and it does not change at the door.
Neighborhoods We Serve in Altadena
We work across the full city, from the flats near the Pasadena border to the hillside streets climbing toward the San Gabriel Mountains. Typical response time for Altadena calls is under two hours.
- Altadena Meadows
- West Altadena (west of Lake Avenue)
- The Meadows
- PresidentStreets (north Altadena, near Loma Alta Drive)
- La Vina
Service Area – Cities Near Altadena
Our Altadena crews also serve the surrounding foothill and valley communities, including Pasadena, CA, San Marino, CA, Sierra Madre, CA, and San Gabriel, CA. If you are just outside the Altadena boundary, call and we will confirm coverage.
Serving Altadena, CA - Our Local Coverage Area
We’re based in the Altadena 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 About HVAC Company in Altadena
We typically arrive within two hours for most Altadena calls, and emergency calls are prioritized during extreme heat events. A live person answers the phone 24/7, so you will not wait through a voicemail queue. Call (626) 657-5344 to get a technician dispatched.
Most installations and some major repairs require permits through Los Angeles County, and we handle the permit paperwork as part of the job. Older homes with outdated electrical panels may also require a separate electrical permit before a high-efficiency system can be connected. We will tell you what is needed before work begins.
Yes, and this is a common situation in Altadena, especially in mid-century homes with radiant heating and no central cooling. Ductless mini-split systems and high-velocity systems are both standard options we install for homes where traditional duct runs are not workable. Each system is sized to the specific house, not picked from a template.
What happens when you call
- 1A real person answersNo phone trees - talk to a local hvac pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Altadena Customers Say
"Installed a heat pump to replace an old oil furnace. Three clear quotes and the install crew was tidy."
- Cheryl B."Honest, direct people. Told me what the furnace needed and nothing more, and the bill matched."
- Eliza S."No pressure to upgrade. He said the old unit had a few years left and fixed the actual problem."
- Jimmy V.