Furnace
High-efficiency furnaces with proper combustion, venting, and airflow design.
ABC Service installs modern condensing furnaces with the airflow and combustion work to actually deliver rated performance.
Services We Provide
Furnace Installation
We install 95%+ AFUE condensing furnaces with ECM blowers, two-stage and modulating equipment.
Furnace Replacement
We evaluate ductwork, gas, venting, and electrical before selecting and installing replacement equipment.
Furnace Repair
Our team troubleshoots ignition, gas valve, inducer, pressure switch, and limit-circuit faults.
Furnace Maintenance
Annual service covers combustion analysis, filter, blower, and safety-circuit verification.
Ready to schedule furnace?
Talk to a specialist today. We respond the same business day with a clear scope and timeline.
Not just new equipment — a system done correctly.
Furnace Installation
ABC Service treats furnace work as combustion engineering. Every install includes static-pressure measurement, gas pressure verification under load, combustion analysis, and CO testing — the work that determines whether a furnace actually delivers its rated AFUE.
We measure manifold gas pressure under steady-state firing, perform combustion analysis at high-fire, and document CO levels at the supply register. Combustion work is life-safety work, and the testing is not optional in our process.
Furnace Replacement
We install 95%+ AFUE condensing furnaces with ECM blowers — two-stage and modulating equipment from Trane, Carrier, Bryant, and Lennox. Selection is matched to load, duct capacity, and the rest of the system, not picked from a catalog.
Two-stage and modulating furnaces only deliver their efficiency advantage when paired with appropriately sized ducts and matched thermostats. We design the package, not just the appliance — and document the configuration for the next technician who services it.
Furnace Repair
The airflow side of the system is where most no-heat and short-cycle complaints actually live. We troubleshoot ignition, gas valve, inducer, pressure-switch, and limit-circuit faults, then repair returns, seal duct leakage, and match blower configuration to the actual home.
Most no-heat and short-cycle complaints trace to airflow restriction, undersized returns, or closed dampers rather than the furnace itself. We measure first, recommend second, and keep replacement off the table until the airflow story checks out.
Furnace Maintenance
Annual service covers combustion analysis, filter replacement, blower verification, and safety-circuit testing. Most premature furnace failures trace back to airflow or combustion issues — both preventable with consistent service.
Our maintenance protocol checks inducer amperage, pressure-switch operation, flame signal, limit cycles, and condensate drainage on every visit. Catching the slow drift in any of those readings is how we keep furnaces in service past the 20-year mark.
Thinking about furnace?
Get a fixed-price proposal from a licensed specialist. Same-day response.
Why this is worth doing right.
Real efficiency
Condensing furnaces deliver 95–98% AFUE — but only when venting, gas pressure, and airflow are correct.
Combustion safety
Combustion equipment requires combustion analysis. We measure CO and O₂ on every commissioned system.
Quiet performance
ECM blowers and proper duct design eliminate the loud, full-blast cycles of older equipment.
Longevity
Most premature furnace failures trace back to airflow and combustion — both preventable with a proper install.
Manufacturers We Service
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Goodman
How a furnace project runs.
- 01Evaluate
We assess existing equipment, loads, venting, electrical, and site constraints on-site.
- 02Design
We size and specify equipment to the building — with options and trade-offs explained plainly.
- 03Install
A dedicated lead tech handles a permitted, clean install with finish-grade workmanship.
- 04Commission
We start up, balance, and verify the system against design intent with calibrated instruments.
- 05Support
We walk you through operation, file rebates, and stand behind the system long-term.
Furnace: frequently asked
Trusted Across the Bay Area
Homeowners and businesses across the Bay Area trust ABC Service for hydronic heating, HVAC, boilers, heat pumps, and electrical work.
Extremely clean boiler installation and excellent communication throughout. They engineered the system properly instead of just swapping a unit on the wall.
Fast response and genuinely knowledgeable about radiant heating. Heat pump retrofit and panel upgrade done in one project — permits and rebates included.
Professional team, clean work, and honest diagnostics. Upsized our service for the EV charger — on time, on budget, and inspected the same week.
Tankless install with recirculation done right. Coordinated cleanly with our GC and walked us through every decision. Easily the most professional trade we worked with.
Radiant floors throughout a remodel. They designed the manifold layout properly and the comfort is incredible. Quietest system we've ever had.
Furnace replacement plus new ductwork. Quiet, efficient, and the crew treated our house better than we would have. Inspection passed first try.
Honest diagnostics and skilled HVAC technicians. They took the time to walk through the system and explain every recommendation.
Engineered for the Bay Area
From the Peninsula to the South Bay, San Francisco, and the Santa Cruz coast — we design, install, and service premium mechanical and electrical systems across six counties. Our team supports high-efficiency boilers, hydronic heating, HVAC, heat pumps, and electrical upgrades for modern Bay Area homes and light commercial properties.
- Santa Clara County
- San Mateo County
- San Francisco County
- Santa Cruz County
- Contra Costa County
- Alameda County
* Additional service areas available upon request.
