Trusted Heating & Furnace for San Diego Homeowners
Heating and furnace repair in San Diego typically costs $175–$825, with most jobs completed same-day when you call before noon. We’re Redwood Heating & Air San Diego, and Gregory Hahn founded this company 13 years ago after earning his Master Technician designation — he still leads every technical decision and diagnoses systems personally. Our 428 verified reviews averaging 4.6 stars reflect what happens when a founder-technician stands behind the work instead of dispatching interchangeable crews.
San Diego’s mild winters still demand reliable heat, especially in canyon-cooled neighborhoods like Rancho Peñasquitos and coastal pockets where temperatures drop 15–20 degrees below daytime highs. We’ve replaced heat exchangers in Clairemont bungalows, revived 1980s Lennox furnaces in La Jolla, and traced gas valve failures in Mira Mesa tract homes built during the 1990s boom. When your furnace quits at 6 a.m. or your heat pump blows cold on a January night, call (844) 875-9451. We stock OEM parts for nine major brands and carry the tools to fix it right the first time.
What Our Heating & Furnace Service Includes
Furnace Repair
Furnace Repair covers everything from blower motor failures to control board replacements on gas and electric units. You’ll know you need it when your system short-cycles, blows cold air, or refuses to ignite entirely. Gregory Hahn brings 13 years of field diagnosis to every repair call in San Diego, and because we’re certified across Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard, we don’t guess — we identify the exact failure and fix it with the right part.
Furnace Replacement
Furnace Replacement becomes the smarter choice when repair costs exceed 50% of a new unit’s value, or when your furnace is past 15 years with a cracked heat exchanger. We size every replacement using Manual J load calculations, not rule-of-thumb square footage estimates that leave San Diego homes over- or under-equipped. From a single-story in Linda Vista to a multi-zone commercial setup near the border, we match the equipment to the actual heating demand.
Furnace Tune-Up
A Furnace Tune-Up is preventive maintenance that catches wear before it becomes a midnight emergency. In San Diego’s salt-air environment, we regularly find blower wheels clogged with coastal dust and flame sensors corroded enough to cause intermittent ignition failures. Our $95–$235 tune-up includes combustion analysis, gas pressure verification, heat exchanger inspection, and filter sizing — the kind of thoroughness that explains why our customers in Coronado and Point Loma schedule these every fall.
Heat Exchanger Repair & Replacement
The heat exchanger is the metal chamber separating combustion gases from your breathable air, and a crack here is a genuine safety issue requiring immediate professional attention. We don’t patch heat exchangers — we replace them or recommend furnace replacement when the unit’s age and condition warrant it. Gregory Hahn inspects every heat exchanger with a borescope camera, documenting cracks with photos you can see, because transparency matters when the stakes involve carbon monoxide risk.
Ignitor Replacement
Modern furnaces use hot surface ignitors instead of standing pilot lights, and these ceramic components fail predictably after 3–5 years of thermal cycling. If your furnace clicks but never flames up, the ignitor is the prime suspect. We stock silicon nitride and silicon carbide ignitors for Trane, Lennox, Goodman, and Rheem units common in San Diego subdivisions, so most ignitor replacements finish in under an hour.
Gas Valve Repair
The gas valve modulates fuel flow to your burners, and when it sticks or fails to open, you get no heat or dangerous delayed ignition — that’s when Gas Valve Repair is needed. We test gas valve coils, check inlet and outlet pressure with digital manometers, and verify proper shutoff function — never guesswork with flammable gas. In older San Diego neighborhoods like Kensington and Talmadge, we’ve replaced original gas valves on furnaces that outlasted three previous HVAC companies.
What happens when you call
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A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Brands We Service for Heating & Furnace
We’ve serviced hundreds of Trane furnaces in San Diego County, from the XV80 variable-speed models popular in 2000s construction to the newer XC95m modulating gas furnaces. Trane’s proprietary communicating systems require specific diagnostic procedures, and Gregory Hahn’s factory-level experience means we don’t default to “replace the board” when the real issue is a failed sensor or wiring corrosion.
Lennox Signature Collection units with their variable-capacity burners demand precise combustion setup — we’ve found improperly adjusted gas pressure in more than one El Cajon installation that previous technicians left at default settings. Goodman and Rheem equipment dominates San Diego’s entry-level and mid-range market, and we stock their most common ignitors, pressure switches, and blower motors because these brands fail in predictable patterns we’ve documented across 13 years of service calls. Whether you have a 30-year-old Rheem Classic or a brand-new Lennox SLP98V, we can help.
Signs You Need Heating & Furnace Right Now
- Your furnace blows cold air or won’t ignite at all. This usually means a failed ignitor, gas valve issue, or control board problem — none of which resolve themselves, and each leaves you without heat when San Diego’s overnight lows dip into the 40s. We’ve responded to these calls at 10 p.m. in Scripps Ranch and 6 a.m. in Chula Vista; the pattern is always the same: the system worked yesterday, and today it doesn’t.
- You smell gas or burning odors near the furnace. A rotten-egg odor indicates a gas leak requiring immediate evacuation and utility notification; a burning dust smell on first startup is normal, but persistent electrical or metallic burning suggests overheating components. We treat every odor call as urgent and carry combustible gas detectors to pinpoint leaks before they escalate.
- The carbon monoxide detector alarms, even intermittently. Any CO reading demands immediate furnace shutdown and professional inspection — this is non-negotiable safety protocol. We’ve traced intermittent alarms to cracked heat exchangers in seemingly “well-maintained” systems in Pacific Beach and Mission Hills, where homeowners assumed their annual filter change was sufficient.
- Your energy bill spiked without explanation. A furnace working harder due to restricted airflow, failing heat exchanger efficiency, or improper gas pressure will consume 20–40% more fuel for the same output. We compare current draw and combustion efficiency against manufacturer specs to isolate whether the problem is mechanical or duct-related.
- You hear banging, screeching, or rattling from the unit. Banging often indicates delayed ignition or loose blower components; screeching points to motor bearing failure; rattling may be a cracked heat exchanger or loose panel. Each sound has a specific mechanical cause, and our 13-year diagnostic database lets Gregory Hahn identify most failures within the first two minutes of listening.
Our Heating & Furnace Process — Step by Step
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Call and describe your symptoms. When you reach Redwood Heating & Air San Diego at (844) 875-9451, we’ll ask about your furnace’s age, brand, recent behavior, and any unusual sounds or smells. This pre-qualification lets Gregory Hahn load the right parts and tools before leaving the shop, cutting diagnostic time at your home.
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On-site system inspection and safety check. We start every visit with combustion analysis and a visual heat exchanger inspection using a borescope camera. Gas pressure gets verified at the manifold; electrical connections are tested for proper voltage and amp draw. No work begins until we confirm the system is safe to operate.
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Root-cause diagnosis with photo documentation. We show you what we find — cracked heat exchangers, corroded flame sensors, failing blower motors — with photos from our inspection cameras. You’ll understand exactly why we’re recommending a specific repair before any parts are ordered.
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Upfront pricing and repair authorization. Your estimate includes parts, labor, and timeline with no hidden fees. For furnace replacement, we provide multiple equipment options with efficiency ratings and operating cost projections tailored to San Diego’s mild heating degree days.
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Repair or installation with post-work testing. Every repair concludes with full system cycling, combustion verification, and temperature rise measurement against manufacturer specifications. We clean our work area, review what was done, and leave you with written documentation for your records.
How Much Does Heating & Furnace Cost in San Diego?
A typical furnace repair in San Diego runs $175–$825 depending on which component fails and how accessible your unit is. Ignitor replacements usually fall at the lower end, around $175–$325, while gas valve or control board work reaches $400–$825. Furnace tune-ups cost $95–$235 and pay for themselves in prevented breakdowns — we’ve documented systems that ran 5+ years without failure after consistent annual maintenance.
Several factors move your price within these ranges. Attic installations in older San Diego homes take longer and cost more than garage or closet units. After-hours emergency calls carry a premium, though we always quote that upfront. Parts availability varies: we stock common Trane, Lennox, Goodman, and Rheem components, but specialty boards or discontinued heat exchangers may require overnight ordering.
To avoid overpaying, get a written estimate that specifies parts and labor separately, and be wary of any technician who can’t explain why they’re recommending replacement over repair. Our free estimates include full diagnosis with no obligation — you’ll know the exact cost before we start. Call (844) 875-9451 for yours.
Heating & Furnace Near San Diego — Our Service Area
We cover San Diego proper plus surrounding communities with typical response times of 45–90 minutes during business hours. Our trucks regularly service Olivehurst, Covina, Citrus, Fremont, Azusa, Coronado, West Covina, Linda, Lemoore, Baldwin Park, and Charter Oak. Coastal routes through Coronado and Point Loma account for salt-air corrosion patterns we factor into every diagnosis; inland areas like El Cajon and La Mesa see different ductwork stress from wider temperature swings. Wherever you’re located, the same Master Technician standards apply.
Serving San Diego, CA — Our Local Coverage Area
We’re based in the San Diego area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
Frequently Asked Questions — Heating & Furnace in San Diego
Heating and furnace service covers repair, replacement, and preventive maintenance of gas and electric furnaces, including critical components like heat exchangers, ignitors, and gas valves. At Redwood Heating & Air San Diego, we diagnose, repair, and install systems from nine major brands for both residential and commercial customers. Gregory Hahn’s Master Technician designation means every technical decision meets the highest credential standard in the trade.
Most furnace repairs in San Diego finish in 1–3 hours, with ignitor and pressure switch replacements often under an hour. Complex jobs involving gas valve replacement or heat exchanger work may extend to a full day, especially in tight attic installations common in Clairemont and University City. We’ll give you a specific time estimate after diagnosis — call (844) 875-9451 to schedule.
Furnace repair typically costs $175–$825, tune-ups run $95–$235, and full replacement ranges from $4,130–$8,850 depending on equipment size and efficiency. Your exact price depends on brand, component failure, and installation accessibility. Call (844) 875-9451 for a free, no-obligation estimate with upfront pricing.
Yes — we service Trane, Lennox, Goodman, Rheem, Carrier, York, Daikin, Bryant, and American Standard furnaces with factory-trained expertise and OEM parts stocking. Gregory Hahn has diagnosed and repaired hundreds of Trane XV and XC series units and Lennox Signature systems across San Diego’s varied housing stock. Whatever brand heats your home, we have the training and parts to fix it.
Yes, we provide emergency HVAC service for urgent residential and commercial breakdowns, including after-hours furnace failures during cold snaps. Our emergency response prioritizes safety issues like gas leaks and carbon monoxide risks, with Gregory Hahn or a senior technician dispatched directly. Call (844) 875-9451 anytime — if it’s urgent, we’ll respond.
We stand behind our workmanship with warranty coverage on parts and labor that varies by repair type, which we’ll detail in your written estimate. OEM parts carry manufacturer warranties ranging from 1–10 years depending on the component. Ask us specifically about warranty terms when you call — we’re transparent about coverage because we expect our repairs to last.
Clear a 3-foot workspace around your furnace, check that your thermostat has fresh batteries, and note any recent symptoms including sounds, smells, or performance changes. If you have maintenance records or previous repair invoices, have them ready — they help us identify recurring patterns. Call (844) 875-9451 to book; estimates are free and there’s no obligation to proceed.
Schedule Your Heating & Furnace Service in San Diego Today
Call Redwood Heating & Air San Diego at (844) 875-9451 for your free estimate. Gregory Hahn will diagnose your system personally, explain what we find in plain terms, and quote upfront pricing before any work begins. Whether it’s a routine tune-up, emergency repair, or full furnace replacement, you’ll get the same master-technician accountability that’s earned us 428 verified reviews across 13 years. No obligation, no surprises — just honest expertise from a founder who still carries the tools.
Written by Gregory Hahn, Owner at Redwood Heating & Air, serving San Diego since 2011.