IRBIS provides HVAC service in Hillsborough, CA, estates trust for precision, with same-day availability and Carrier-certified technicians on every call. Our team handles the full HVAC lifecycle, sized correctly for the largest homes on the Peninsula.
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IRBIS delivers full HVAC services in Hillsborough -- cooling, heating, heat pumps, and water heaters -- with same-day availability and Carrier-certified status. As the HVAC contractor, estate owners call first, and our team treats every property as a multi-zone job. Precise load calculation is part of every visit, not an upsell.
Hillsborough summers average 78-82°F with occasional heat waves above 90°F. IRBIS handles AC repair, maintenance, installation, and replacement -- sized for estate square footage.
January lows average 43°F, and coastal fog makes it feel colder than the number suggests. A furnace built for a 2,000 sq ft home fails in a 6,000 sq ft estate.
Mild Peninsula winters make heat pumps a practical year-round choice -- one system for heating and cooling. Qualifying installations may be eligible for Peninsula Clean Energy (PCE) rebates.
Repair, maintenance, and installation - traditional and heat pump water heaters -- sized for main residences, guest houses, and pool buildings.
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July highs average 78-82°F, with occasional heat waves pushing past 90°F. January lows sit around 43°F, and coastal fog makes the air feel colder than the thermometer shows. Annual rainfall reaches roughly 25 inches -- higher than most South Bay cities --, and Hillsborough sits inside the California Fog Belt, logging 100+ fog days a year. Summer humidity runs 60-75% on many days, which means HVAC systems perform differently here than in the dry inland South Bay.
Hillsborough has no commercial buildings and no apartments -- the town charter limits the city to private residential estates only. Homes range from 1920s Mediterranean Revival mansions to contemporary builds, often 4,000-10,000+ sq ft, with minimum lot sizes of half an acre. Many properties include guest houses, wine cellars, or pool buildings that require independent climate zones rather than a single system serving the whole estate. Smart home integration -- Google Home, Apple HomeKit -- is common across Hillsborough properties, and any HVAC system installed has to be compatible. This is not a standard HVAC job. Proper load calculation, multi-zone design, clean installation around historic finishes, and permit management with the Town of Hillsborough are required, not optional extras.
A miscalculated system on a 6,000+ sq ft estate does not just run inefficiently, it leaves entire wings too hot or too cold. Multi-zone load calculation prevents the uneven temperatures common in undersized estate installations.
Wildfire smoke season runs June through October, and particulates infiltrate even well-sealed Hillsborough homes. High-MERV filtration and tighter duct sealing keep indoor air quality stable for estates surrounded by wooded hillsides.
IRBIS HVAC services cover every residential estate type in Hillsborough -- from 1920s Mediterranean Revival mansions to contemporary estates with detached guest houses and pool buildings.
Single-family estates make up the entire Hillsborough housing stock, spanning the 1920s through today. IRBIS sizes systems for square footage well above the South Bay average.
Hillsborough's town charter prohibits townhouses and condos -- every property is a single-family estate. The closest equivalent IRBIS service is a detached guest house with its own HVAC zone.
Many original Hillsborough mansions built before 1960 have no central ductwork or chases too narrow for modern systems. Ductless multi-split installations solve this without disturbing historic plaster or trim.
Heat pump, water heater, and EV charger installed as one coordinated package -- built for California's 2030 gas equipment ban and eligible for PCE rebates.
Carrier Presidential Award Winner
Not every HVAC company earns this — IRBIS does. Carrier is the benchmark for premium HVAC, and this award confirms our installation and service standards meet their highest criteria.
10-Year Parts & Labor Warranty
Competitors offer 12 months on repairs and 3 years on installations. IRBIS gives you 10 years, in writing.
Same-Day Service, 7 Days a Week
Call before noon, and we will arrive today.
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Licensed & Insured — CSLB #1048009
Every technician is a licensed HVAC professional, not a subcontractor.
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Carrier, Trane, Lennox, Rheem, Daikin, Mitsubishi, Goodman -- as the local HVAC company estate owners call for heating and air conditioning of any scale, IRBIS services every major brand regardless of what is currently installed. Whether it is a single-zone repair or full-estate heating and air conditioning replacement, our HVAC contractor team covers any system on the property.
IRBIS HVAC technicians know Hillsborough's estate neighborhoods inside out -- ZIP code 94010, covering the Carolands, Skyfarm, Tobin Clark Estate, Lower Hillsborough, and the hillside properties along Ralston Avenue and Polhemus Road. Whether the property is a 1920s Mediterranean Revival or a contemporary multi-wing build, our team understands the sizing and zoning demands unique to estate-scale homes here.
Multi-zone estate systems need more frequent attention than a standard home. The IRBIS Home Care Plan keeps every zone in your Hillsborough property tuned year-round -- for $24.95 a month.
Seasonal Maintenance
Full HVAC, Plumbing, Electrical Maintenance
Free Inspections
Regular fee $115
VIP Priority Scheduling
Get an appointment within 48h or faster
Special discounts
20% off for repairs, 5% off for replacements
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Step 1
Our trained and licensed specialists will diagnose your furnace, meticulously evaluating all components. This thorough assessment ensures the root cause of any issue is identified, preventing recurring problems and ensuring the system operates at peak efficiency.
Step 2
Based on the assessment, we will recommend tailored solutions to address your furnace’s issues. This approach empowers homeowners to make informed decisions about repairs, considering factors such as budget, urgency, and long-term system performance.
Step 3
Once you select a repair option, IRBIS technicians will carry out the necessary repairs using high-quality parts and tools. Their expertise and well-equipped vans allow them to handle most repairs promptly, ensuring your HVAC system is back to optimal efficiency with minimal downtime.
Step 4
We provide ongoing support and expert advice to help ensure the continued efficiency of your HVAC system.
October 8, 2026
Residents of the City of Santa Clara, California, can get up to $10,000 back when they replace an old gas furnace with an electric heat pump. The rebate is offered by Silicon Valley Power (SVP), the city's municipal electric utility.
October 1, 2026
Search for a cold weather plumbing checklist, and you will get the same list every time: insulate your pipes, disconnect the garden hose, let the faucets drip overnight. It is good advice, and it is written for Chicago.
September 28, 2026
Your furnace has been sitting idle since spring. On some October evening, the Bay Area drops into the 40s, you push the thermostat up for the first time in months, and the system pulls air through whatever furnace filter was left in the slot back in May. That first heat cycle is when a neglected filter does the most damage: months of collected dust, pollen, pet hair, and summer wildfire smoke particles sitting directly in front of your blower.
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Questions & Answers
A standard single-zone replacement runs lower than a multi-zone estate system, which factors in additional zones, ductwork, and controls. We provide a written estimate before any work begins.
Yes. We install smart thermostats and zoning controls compatible with both platforms, matching the smart home integration already common across Hillsborough estates.
Every IRBIS installation comes with a 10-year parts and labor warranty -- a full decade of coverage, well beyond the 1-3 years most local contractors offer.
Yes. IRBIS handles the full PCE application process and confirms current funding status at your estimate, since program amounts update throughout the year.
Most years, yes. Average highs run 78-82°F, but heat waves push past 90°F, and a 6,000 sq ft home holds that heat for days without proper cooling capacity.
IRBIS pulls all required permits and coordinates inspections with the Town of Hillsborough. You do not need to handle any paperwork -- we manage the entire process.
No. Our technicians route ductless lineset and minimal ductwork to avoid disturbing historic plaster and trim. We walk through the plan with you before any work begins.
Yes. Detached structures get their own zone or standalone system, controlled separately from the main house. This is one of the most common requests on Hillsborough properties.
We run a full Manual J load calculation per zone, factoring square footage, ceiling height, window exposure, and insulation. Estate homes typically need multiple independent zones, not one oversized unit.
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