IRBIS provides HVAC services Atherton estate owners count on, with same-day availability and Carrier-certified technicians ready for properties of any scale. Every property is exclusively residential, and IRBIS handles large-property load calculations, multi-zone systems, and PCE rebate paperwork from the first estimate.
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IRBIS delivers residential HVAC services properties require: cooling, heating, heat pumps, and water heaters, with same-day availability and Carrier-certified status. Atherton's signature tree-lined streets moderate temperature on many lots, which means standard residential sizing formulas often miss on large estates. Proper load calculation per structure is the starting point for every job.
Atherton summer averages peak near 77°F, but heat waves push noticeably higher across the Peninsula. Large estate footprints demand precise load calculation before any central AC installation. Properties sized on Bay Area averages without site-specific data end up with systems that short-cycle or underperform.
January lows average 43°F and the Peninsula heating season runs November through March. Estate properties with high ceilings and multiple wings often need independent heating zones rather than one system attempting to cover the full square footage.
Atherton's 43-77°F temperature range is well suited for heat pump efficiency year-round. One system replaces both a gas furnace and a separate AC unit. Qualifying installations may be eligible for Peninsula Clean Energy (PCE) rebates.
Repair, maintenance, and installation for traditional and heat pump water heater models, for main house and guest house systems.
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Atherton sits in a mild Mediterranean climate with warm dry summers and cool wet winters, but the size and character of properties here change what that climate means for HVAC. Tree-lined streets and large wooded lots moderate temperature differently than open suburban blocks, and estate-scale square footage responds to seasonal shifts in ways standard sizing models do not capture.
Atherton's tree-lined lots moderate temperature compared to exposed properties, but that shading effect varies by lot, orientation, and canopy density. Load calculation for an estate has to account for shade coverage, building orientation, and total square footage across all occupied structures. Standard residential sizing formulas built for suburban averages routinely miss on properties this scale.
Peninsula winters run November through March with January lows around 43°F. High-ceiling estate properties lose heat through volume and surface area at rates a standard home does not approach. System sizing for estates has to factor those differences in, not assume a typical residential load curve.
Peninsula Clean Energy serves Atherton, and qualifying upgrades can stack PCE rebates with state programs. IRBIS confirms current amounts and handles all paperwork at the time of your estimate.
Available Rebates
California Energy-Smart Homes $4250
Tech Clean up to $1000
Silicon Valley Clean Energy up to $3000
Westlight Energy up $2000
As the local HVAC company Atherton estate owners call for full-property HVAC planning, IRBIS services every residential structure type found on properties, from main estate residences to guest houses and new all-electric construction.
Guest houses need their own independent HVAC system, not an extension from the main residence. IRBIS plans separate zones for every occupied structure on the property during the estimate visit.
New construction calls for load calculations that account for lot size, canopy cover, and building orientation from the start. IRBIS installs a heat pump, water heater, and EV charger as one coordinated package ahead of California's gas equipment deadline.
All of Atherton's approximately 2,500 residential properties are single-family estates on large lots. IRBIS sizes and zones systems for the full square footage and ceiling height of each structure, not a suburban average.
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. IRBIS handles AC repair Atherton properties need on any brand, regardless of what is currently installed. One call covers any system on the property, from the main residence to any secondary structure.
IRBIS serves all of Atherton, ZIP code 94027, from West and East Atherton to the Menlo Oaks area, the Holbrook-Palmer Park area, and properties along the El Camino Real corridor. Our same-day technicians understand the scale and access requirements that estate properties present, and plan installations accordingly before the crew arrives.
Multi-zone estate systems in Atherton run more components than a standard home, and each zone needs its own service schedule. The IRBIS Home Care Plan keeps every system on the property covered for $24.95 a month.
Join for only $24.95 / 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
Every IRBIS installation comes with a 10-year parts and labor warranty. Most local contractors offer 1-3 years. We cover a full decade at no extra cost.
Same-day service is available 7 days a week. Call before noon, and we can typically have a technician at the property that afternoon, including weekends.
Yes. The 43-77°F annual range is ideal for heat pump efficiency in both directions. One system replaces both a gas furnace and a separate AC unit, and PCE rebates may apply to the installation.
Yes. Guest houses get their own independent system, planned and sized separately from the main residence. IRBIS scopes all structures during the initial estimate so nothing is left out.
Peninsula Clean Energy (PCE) rebates apply to qualifying heat pump and high-efficiency AC installations, and can be stacked with state programs. IRBIS confirms current amounts at your estimate since programs update throughout the year.
We run a Manual J load calculation per zone, factoring square footage, ceiling height, building orientation, canopy cover, and insulation. Atherton estates typically need multiple independent zones rather than one system covering the full property.
Yes. IRBIS works on estates of any scale in Atherton, from single-structure main residences to multi-building properties with guest houses and secondary structures, each requiring its own system.
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