AC Repair
Warm air, a humming outdoor unit or a tripped breaker: we find the failed part and fix most AC problems in one visit.
Learn moreLos Angeles County
San Gabriel Valley HVAC service across Los Angeles County, from Pasadena to Covina
Los Angeles County is huge, and we do not try to cover all of it.
Los Angeles County at a glance
- Served from
- Old Pasadena office
- Phone
- (626) 879-0711
- Hours
- Open 24/7
Quick answer
Marco's serves the San Gabriel Valley and foothill cities of Los Angeles County, from Pasadena and Altadena east to Glendora and Covina, plus Glendale, Burbank and northeast Los Angeles to the west. Our own technicians work out of offices in Old Pasadena and Duarte. We repair and install AC, furnaces, heat pumps and ducts. Call (626) 879-0711 any hour, 24/7.
Overview
Heating and cooling help in Los Angeles County
Los Angeles County is huge, and we do not try to cover all of it. Our service area is the part we know best: the San Gabriel Valley and the foothill communities along the San Gabriel Mountains, reaching west to Glendale, Burbank, the Crescenta Valley and the northeast Los Angeles neighborhoods next to Pasadena. That keeps drive times reasonable from our two offices and lets our technicians learn the housing street by street.
Across that area the work changes with the place. Old Pasadena and Highland Park have Craftsman bungalows with floor furnaces. Arcadia and Temple City have big new two-story homes. Monrovia, Sierra Madre, Altadena and Glendora sit right under the mountains with fire season concerns. El Monte and Rosemead have postwar houses with wall furnaces and window units. Each city page on this site covers what we see there.
The range of housing across our part of the county
The county portion we serve has some of the oldest housing in Southern California. Craftsman bungalows from the 1900s to 1920s and Spanish Revival homes from the 1920s fill Pasadena, South Pasadena, Highland Park and parts of Glendale and Alhambra. Many were built with floor furnaces or wall furnaces, and central air was added later or never. Postwar ranch homes from the 1940s to 1960s cover much of Arcadia, Temple City, Covina, West Covina and El Monte, usually with attic ducts and a closet or garage furnace.
Newer housing includes large two-story homes built on older lots in Arcadia, Temple City and San Gabriel, hillside houses in La Canada Flintridge, Monterey Park and the West Covina hills, and backyard ADUs going up in almost every city. Each needs a different approach to heating and cooling.
Common problems
Common HVAC issues across the San Gabriel Valley
Summer heat waves
Valley afternoons often reach the high 90s and pass 100 F. Long run times wear out capacitors, fan motors and compressors, and older systems fall behind on the hottest days.
Wildfire smoke and ash
Foothill cities face smoke during fire season. The January 2025 Eaton Fire left smoke and ash in many homes near Altadena and Pasadena, and duct inspection and cleaning were part of recovery.
Old gas wall and floor furnaces
Older homes still run decades-old wall and floor furnaces. We test for carbon monoxide, check venting, and help owners decide between repair, replacement or a heat pump.
Leaky attic ducts
Original or aging attic ducts leak cooled air into hot attics across the valley. Sealing or replacing them often fixes weak airflow and high summer bills.
Santa Ana wind dust
Wind days push dust and debris into outdoor coils and filters across the foothill cities. Regular coil cleaning and filter changes keep systems running normally.
Most requested
What we do most across the county
AC repair and emergency HVAC repair keep homes cool through heat waves, and our 24/7 phone line means a breakdown at night still gets answered. Furnace repair covers cold nights in the 30s and 40s. Heat pump installation is growing as owners replace old gas furnaces and AC together. Duct cleaning is most useful after smoke events when debris is present. A maintenance plan puts two system checks a year on the calendar, which prevents many of the summer and winter breakdowns.
Furnace Repair
No heat on a cold night? We trace the ignition sequence, find the failed part and fix most furnaces in a single visit.
Learn moreHeat Pump Installation
New ducted and inverter heat pumps sized to your Pasadena home, with permits, line sets, electrical and duct checks included in the quote.
Learn moreAir Duct Cleaning
Camera inspection first, then negative-pressure HEPA cleaning of supply, return, blower and coil when your ducts actually need it.
Learn more24/7 Emergency HVAC Repair
Night, weekend and holiday repairs for a dead AC in a heat wave or a furnace that quits on a cold night, any hour.
Learn moreHVAC Maintenance Plans
Two visits a year, cooling in spring and heating in fall, so small problems get caught before a heat wave or a cold night.
Learn morePractical notes for Los Angeles County homeowners
Rebuilding after the Eaton Fire continues in Altadena and nearby, and we approach that work carefully and respectfully. Rebuild homes need new HVAC designed to current energy rules, often with heat pumps, sealed ducts and good filtration. Homes that survived but took in smoke may need duct inspection, filter upgrades and sometimes cleaning. We look first and only recommend what the house needs.
Traffic matters in this part of the county. We route technicians from whichever office is closer, and we give honest arrival windows rather than promises we cannot keep. Call (626) 879-0711 any hour and tell us your city, the problem and anything about access, and we will plan the visit.
How we cover the San Gabriel Valley and foothills
We run two offices so no part of the area is a long trip. Our Old Pasadena office on Colorado Boulevard covers Pasadena and its neighborhoods, Altadena, South Pasadena, San Marino, Glendale, Burbank, La Canada Flintridge, La Crescenta and northeast Los Angeles. Our head office in Duarte covers the eastern half of the valley: Arcadia, Monrovia, Sierra Madre, Azusa, Glendora, Covina, West Covina, El Monte, Temple City, Rosemead and nearby. The 210 freeway ties the two together, so a technician can cross the valley quickly when a call needs the right person or part.
Utilities differ across the county, and that matters for rebates. Pasadena Water and Power serves Pasadena. Glendale and Burbank run their own city utilities, as does Azusa. The Los Angeles Department of Water and Power serves the city of Los Angeles. Southern California Edison covers most other valley cities, and SoCalGas provides gas almost everywhere. Ask about current rebates from your utility and state heat pump incentives when funding is open. We handle the permit where the city requires one, and Title 24 rules can require duct leakage testing on replacements.
Cities
Cities we serve in Los Angeles County
Pasadena
City hub 91101. AC, Furnace & Heat Pump Service.
See areaAltadena
City 91001. Duct Cleaning & Rebuild HVAC Installs.
See areaSouth Pasadena
City 91030. Wall Furnace & Central AC Upgrades.
See areaSan Marino
City 91108. Multi-Zone HVAC & System Replacement.
See areaArcadia
City 91006. AC Replacement & Heat Pump Installs.
See areaSierra Madre
City 91024. Furnace Repair & Ductless Installs.
See areaMonrovia
City 91016. AC Repair & Furnace Tune-Ups.
See areaDuarte
City 91010. Emergency AC & Heating Repair.
See areaGlendale
City 91206. Heat Pump Conversions & AC Repair.
See areaLa Canada Flintridge
City 91011. Hillside AC & Zoning Systems.
See areaLa Crescenta
City 91214. Furnace Replacement & Air Filtration.
See areaBurbank
City 91501. Central AC Repair & Duct Sealing.
See areaAlhambra
City 91801. Floor Furnace & Mini-Split Installs.
See areaSan Gabriel
City 91776. Furnace & AC Repair.
See areaTemple City
City 91780. AC Zoning & New Home HVAC.
See areaMonterey Park
City 91754. Hillside AC & Heat Pump Service.
See areaRosemead
City 91770. Wall Furnace & Mini-Split Service.
See areaEl Monte
City 91731. AC Repair & Duct Replacement.
See areaAzusa
City 91702. Heat Pump & Furnace Service.
See areaGlendora
City 91740. Foothill AC & Air Filtration.
See areaCovina
City 91723. AC Replacement & Tune-Ups.
See areaWest Covina
City 91790. Gas to Heat Pump Conversions.
See areaLos Angeles
City 90041. Craftsman & Hillside HVAC.
See areaMontrose
City 91020. Crescenta Valley Furnace & AC Repair.
See areaTujunga
City 91042. Smoke Filtration & AC Replacement.
See areaBaldwin Park
City 91706. AC Repair & Attic Duct Upgrades.
See areaSouth El Monte
City 91733. Commercial HVAC & Home AC Repair.
See areaMontebello
City 90640. Furnace Replacement & AC Tune-Ups.
See areaWhittier
City 90601. Older Home Furnace & AC Upgrades.
See areaHacienda Heights
City 91745. Hillside Heat Pump & Duct Sealing.
See areaRowland Heights
City 91748. Two-Zone AC & Smart Thermostats.
See areaLa Puente
City 91744. AC Installation & Refrigerant Repair.
See areaWalnut
City 91789. AC Tune-Ups & Refrigerant Leak Repair.
See areaDiamond Bar
City 91765. Upstairs Cooling & Zoning Systems.
See areaSan Dimas
City 91773. Furnace Tune-Ups & AC Repair.
See areaLa Verne
City 91750. Heat Pump Repair & Smart Thermostats.
See areaClaremont
City 91711. Mini-Splits & Whole-House Fans.
See areaPomona
City 91766. Historic Home Heating & AC Installs.
See areaQuestions
Los Angeles County heating and cooling questions
We cover the San Gabriel Valley and foothill cities of Los Angeles County: Pasadena, Altadena, South Pasadena, San Marino, Arcadia, Sierra Madre, Monrovia, Duarte, Azusa, Glendora, Covina, West Covina, El Monte, Temple City, Rosemead, San Gabriel, Alhambra and Monterey Park, plus Glendale, Burbank, La Canada Flintridge, La Crescenta and northeast Los Angeles. Call (626) 879-0711 if you are unsure.
Yes. For rebuild homes in Altadena and nearby parts of Los Angeles County, we design and install new heating and cooling to current energy rules, often heat pumps with sealed ducts and better filtration. For homes that took in smoke, we inspect the ducts and equipment and recommend cleaning only when debris is present. We work alongside your builder.
Electric utilities differ by city in Los Angeles County. Pasadena has PWP, Glendale and Burbank have their own city utilities, the city of Los Angeles has LADWP, and most other valley cities have SCE. SoCalGas serves gas widely. Ask about current rebates from your utility and state heat pump incentives when funding is open.
Our Old Pasadena office covers Pasadena, the western foothill cities, Glendale, Burbank and northeast Los Angeles. Our Duarte head office covers the eastern San Gabriel Valley from Arcadia to Covina. We send whichever technician can reach you soonest. Call (626) 879-0711 any hour, 24/7.
Heating or cooling trouble in Los Angeles County?
Call our Pasadena line any hour. A person answers, asks a few questions about the system, and gives you an arrival window.
(626) 879-0711Answering 24 hours, 7 days