Atherton homeowners can count on Plum HVAC specialists to deliver comprehensive, locally tailored services, from installation and replacement to maintenance, ductwork, zoning, and indoor air quality. Our approach emphasizes accurate system sizing using Manual J and D, energy-efficient heat pumps and ductless options, smart thermostat integration, and meticulous testing with HERS coordination for rebates. We provide our clients with clear process steps, ensure licensing compliance, offer warranty support, and create maintenance plans designed to maximize comfort, efficiency, and long-term reliability in Atherton homes. All our work adheres to local codes with transparent pricing and ongoing support.

Schedule My Service

(650) 605 – 5986

HVAC Company in Atherton, CA

Your Atherton home deserves HVAC solutions that match the local climate, architectural style, and high expectations for comfort and indoor air quality. This page explains the comprehensive HVAC services available in Atherton, CA — from installation and replacement to repair, maintenance, ductwork, zoning, and indoor air quality — plus licensing, warranty and rebate support, a clear service process (assessment, system sizing, installation, testing and HERS coordination), COVID-19 safety measures, and maintenance plan options.

Why specialized HVAC services matter in Atherton

Atherton properties range from modern builds to large, older estates with complex duct systems and high-efficiency performance goals. The Bay Area’s Mediterranean climate brings mild, wet winters and warm, sometimes hot, dry summers. In recent seasons, wildfire smoke and increasing electrification incentives have made indoor air quality and efficient heat pump solutions top priorities for homeowners. Proper system sizing, ductwork optimization, and air cleaning are essential to maintain comfort, reduce energy costs, and protect indoor air during smoke events.

Core HVAC services offered in Atherton, CA

Installation and replacement of furnaces, air conditioning systems, heat pumps, and ductless mini-splits
Repair and emergency service for all major HVAC equipment
Routine maintenance and seasonal tune-ups for peak efficiency and reliability
Ductwork design, sealing, repair, and insulation for improved airflow and comfort balance
Smart thermostat setup, integration, and zoning system design for multi-zone control and energy savings
Indoor air quality (IAQ) solutions: high-efficiency filtration (MERV/HEPA), UV germicidal lights, mechanical ventilation, ERV/HRV systems, and whole-home purifiers
Maintenance plans with scheduled inspections, priority service, filter replacement guidance, and documented tune-ups
Warranty management, licensing and compliance documentation (CSLB), and rebate/tax-credit assistance

Common HVAC issues in Atherton homes

Inconsistent temperatures across large rooms or multi-level layouts due to undersized equipment or poor zoning
Reduced cooling capacity on hotter summer days from undersized AC or dirty coils
Higher-than-expected energy bills caused by duct leaks, poor insulation, or aging equipment
Indoor air quality concerns during wildfire smoke events, requiring enhanced filtration and sealed systems
Short cycling or frequent repairs from improper system sizing or failing components
Compatibility challenges when retrofitting older homes with modern heat pumps or ductless systems

How we approach assessment and system sizing

A reliable outcome starts with a thorough on-site assessment:

Home evaluation: Inspect existing equipment, duct layout, insulation levels, windows, and occupancy patterns.
Load calculation: Use Manual J and Manual D methods to determine accurate heating and cooling loads and duct sizing needs.
Equipment selection: Recommend systems (furnace, AC, heat pump, or ductless) sized to the calculated load, factoring efficiency goals, noise criteria, and comfort preferences.
Zoning and controls: Design zoning systems or ductless solutions where room-level control improves comfort and efficiency.Proper sizing avoids common mistakes like oversized AC units that short cycle or undersized heat pumps that struggle on peak days.

Professional installation, testing, and HERS coordination

Professional installation follows manufacturer specifications and California building codes, with attention to refrigerant charge, proper airflow, and sealed duct connections.
Commissioning and testing include airflow verification, static pressure checks, refrigerant measurements, thermostat calibration, and system run-through to ensure performance matches design expectations.
HERS coordination: For projects pursuing energy ratings or qualifying for specific rebates, we coordinate necessary testing, documentation, and HERS verification to support rebate applications and compliance with local energy programs.

Maintenance plans and tune-ups

Routine maintenance preserves comfort, reduces repair frequency, and extends equipment life. Typical maintenance tasks include:

Filter inspection and replacement guidance
Coil cleaning and fin straightening
Lubrication and belt inspection
Blower and motor checks, refrigerant level verification
Combustion safety testing for gas furnaces
Duct inspection and basic sealingMaintenance plans typically offer scheduled seasonal tune-ups, priority scheduling, and documented service records that help maintain warranties and maximize system longevity.

Indoor air quality and wildfire readiness

Atherton homeowners increasingly prioritize IAQ due to smoke events and year-round pollen concerns. Effective strategies include:

Upgraded filtration: High-MERV or HEPA options for whole-home systems where compatible
Sealing and pressurization: Minimize infiltration to prevent outdoor smoke entry during events
Mechanical ventilation: ERV/HRV solutions for balanced, energy-conscious ventilation
In-duct UV or portable purification for pathogen reductionCombining these measures with well-sealed HVAC systems significantly improves indoor air during smoke episodes and everyday living.

Ductwork, thermostats, and zoning systems

Ductwork improvements often produce dramatic comfort and efficiency gains: sealing leaks, adding insulation, and balancing airflow eliminate hot or cold spots. For large Atherton homes, zoning systems paired with smart thermostats deliver room-by-room control and reduce wasted conditioning of unused spaces. Ductless mini-splits are a minimally invasive alternative for additions, detached areas, or rooms where extending ductwork is impractical.

Warranty, licensing (CSLB) and rebate assistance

Licensing: Work performed by appropriately licensed technicians and contractors compliant with California State License Board (CSLB) requirements ensures code compliance and consumer protections.
Warranties: Clear documentation for manufacturer and workmanship warranties is provided, and routine maintenance helps keep warranties valid.
Rebates and incentives: Assistance is offered to identify potential local utility rebates, state incentives, and federal tax credits for high-efficiency equipment and electrification projects (for example, qualifying heat pumps). Documentation and coordination for rebate applications and required HERS verification are part of the support package.

COVID-19 safety precautions

Technicians follow enhanced safety protocols to protect occupants and staff: pre-appointment health screening, use of personal protective equipment, minimized time indoors where feasible, regular tool and vehicle sanitization, and adherence to current public health guidance. Service procedures are adapted to reduce contact while preserving diagnostic accuracy and installation quality.

What to expect from a high-quality HVAC engagement

Transparent evaluation with documented findings and equipment recommendations tied to energy use and comfort goals
Clear explanation of benefits for each option (efficiency, noise, lifecycle, IAQ impacts)
Professional installation, testing, and performance verification
Ongoing maintenance plans and post-installation support that protect investment and warranties
Support with licensing, required inspections, and rebate coordination to maximize incentives

For Atherton residents who prioritize long-term comfort, energy efficiency, and indoor air quality, the right HVAC solution begins with an accurate assessment and ends with professional installation and diligent maintenance. Quality design, proper sizing, and IAQ measures tailored to Atherton’s climate and home styles deliver reliable, efficient performance year round.

testimonials

hear what our satisfied clients have to say

5.0

We found Plum HVAC in 2024 after spending more than 2 months searching and comparing estimates. The owner Sam gave us a very competitive price for a Mitsubishi mini-split and the installation went off without a hitch. Our experience was so positive that we later requested their services twice more to also install A/Cs for our 2 other rooms. Their technician, Jake, led our installations each time and we were very impressed by their professionalism and quality of work. Now 1 year in and we could not be any happier, nor have we encountered any issues with our models.

Jesse Y.

5.0

Sam of Plum HVAC, responded to our Heat Pump installation request promptly and provided a very competitive estimate after an onsite visit. He was very flexible and patient to answer and explain our questions. After we signed the contract, he and his team of 4 worked very hard to deliver and install the whole Heat Pump system on time with good quality. I am particularly impressed by their problem solving skills to overcome different connection challenges for the attic installation. Each day before they started, they covered the floors with protection blankets and cleaned after they were done for the day. They also revised the drainage and electric work per the city inspection guidance. Sam and his team were professional and honest so we highly recommend Plum HVAC to any customers who need HVAC work done for their houses.

Chunshi C.

5.0

We needed to install a mini-split in a backyard unit. Sam and his team helped with this, and they did a fantastic job. Sam visited our place and clearly explained to me what needed to be done, and offered a great price. He scheduled the job for a few days later, and his team performed the job with extraordinary quality. Later, I noticed a minor issue and reached out to them. Sam helped me to fix the issue on a second visit by his team later in the week, providing top-notch customer service. I will work with them in the future for my HVAC jobs, and highly recommend them given their excellent work quality and customer service.

Majid J.

5.0

I reached out to 4 companies for mini split quotes; Plum HVAC pricing came in the lowest. Beyond that, Sam was very knowledgeable and kind during the in home consultation. He offered a quote in person, & stuck by it. They removed our old furnace, and installed a two head mini split in our two story townhouse. The work as you can see is very clean! The guys who installed it were very fun & professional. Sam & his team were communicative the whole way through including the permitting process. They took roughly one full day for install, which was very fast! Including removal & disposal of our old furnace. Natalie was very helpful throughout the Bayren Rebate process & always available for any questions! This system has changed our lives, wish we would have gotten it done sooner! It’s way better than we could have imagined.

Bobby R.

5.0

Plum HVAC exceeded my expectations in every way. Sam and his installer team were not only professional but also incredibly responsible throughout the entire process. They provided top-notch service at a very reasonable price, which is hard to come by these days. I highly recommend Plum HVAC to anyone looking for quality HVAC services. You won't be disappointed!

A Chui

5.0

I recently engaged Plum HVAC to install two mini-split units at my residence, and I'm thrilled with the outcome.Throughout the entire process, from the initial consultation to the project's completion, Plum HVAC showcased professionalism and expertise. The technician, Sam, arrived promptly and conducted a comprehensive assessment of my HVAC system. Sam took the time to thoroughly explain the technicians' tasks, the estimated duration of the project, and provided transparent pricing options.

Romero J.

5.0

Wonderful experience with Plum HVAC on a heat pump installation! I checked several companies, compared their recommendations, timelines, reputations and prices.Sam, the owner, was very professional and has almost 2 decades of experience in HVAC. When I asked dumb questions, he answered most graciously. And when I noted that some companies we queried said we could get away WITHOUT replacing our original ductwork from 1965, he gave us his honest opinion why that wasn't a good idea. (Hubby remembered later that people who worked in our attic adding insulation told us there were lots of duct leaks.)

Marlene S.

5.0

I called 8 different HVAC companies for quotes for a heat pump heating/ac system because I want to save money by switching from a forced air gas furnace to an electric heat pump system which will give me both heating and air conditioning. In addition my old furnace (circa 1991) was way oversized for my home and the air coming out too noisy. The New heat pump system is quieter and more efficient. Back to the quotes for the system, all the other 7 companies sent a salesperson/advisor to give the quote. Sam, the owner of Plum HVAC came our to give the quote. He was quick with his quote and was very knowledgeable. He didn't try to upsell me on anything and have the lowest quote of them all. His price was 60% less than the highest quote and 15% lower than the next second lowest quote.

Michael C.

5.0

Plum HVAC is an extremely professional, knowledgeable, and an established company to hire. I highly recommend Plum HVAC! Sam and his crew did a wonderful job. Sam worked with my schedule and his crew had completed the job with ease.

Blake

5.0

Sam was one of the most professional business owners I had the chance to meet over the past few years and I'm so happy I trusted him to install our new A/C unit.- He showed up on time- He was transparent (and reasonable) regarding pricing- He offered 2-3 options- His crew did a very clean/thorough jobWhat I loved the most though, was the fact he was very easy to communicate with. I would definitely use him again and recommend him to our neighbors/friends.

Bruno L.

5.0

We recently had a complicated Bryant Evolution dual fuel system with variable speed and zoning installed in our home by Plum HVAC, and we are very pleased! The team also changed the entire crawl space ducting, ensuring a comprehensive upgrade. The price was fair, and the team was always on time and easy to contact. Sam Mousavi, the head of the team, paid great attention to detail and demonstrated a strong understanding of systems. His expertise in HVAC systems and his friendly character made us feel comfortable throughout the process. We highly recommend Plum HVAC for their professionalism and excellent service.

Amirali B.

5.0

I cannot say enough about Plum HVAC, who replaced my aging heater furnace, and in particular Sam. Sam was very highly recommended by my sister, who replaced her furnace and added air conditioning.First, they gave me a good deal for a 2-stage, at the same cost as the lowest bid for a 1-stage. The other bids were dancing around some gas line work made by previous owners.

Kumar S.

Leave a Review

View All Reviews