Heat pump replacement in Los Altos, CA, with Plum HVAC, is a strategic upgrade that enhances your comfort, efficiency, and long-term reliability. Our guide outlines the evaluation, sizing, permitting, installation, and post-installation steps, including energy savings, rebate options, and financing considerations. We explain when replacement is preferable to repair, how our professionals determine appropriate equipment with Manual J sizing, and what customers can expect during commissioning, warranty coverage, and ongoing maintenance to maximize performance and value over time for homeowners.

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Heat Pump Replacement in Los Altos, CA

Replacing a heat pump is one of the most impactful home upgrades for comfort, energy savings, and long-term reliability. In Los Altos, CA, where mild winters and warm summer heat waves place varied demands on heating and cooling, a properly selected and installed heat pump keeps indoor comfort steady while lowering utility bills. This page explains the heat pump replacement process, why replacement may be necessary, equipment and sizing considerations, local permitting and rebate guidance, and what to expect after installation.

Why replace your heat pump: common signs in Los Altos, CA

Many Los Altos homeowners delay replacement until a system fails. Replacing earlier when performance declines avoids repeated breakdowns and higher operating costs. Common heat pump replacement issues in Los Altos, CA include:

Age: Most heat pumps last 10 to 15 years. Systems approaching or exceeding that age often lose efficiency and reliability.
Declining efficiency: Rising energy bills despite similar usage often indicate refrigerant loss, worn compressors, or outdated equipment with low SEER/HSPF ratings.
Recurrent failures: Frequent compressor or control board repairs are a sign repair costs may soon exceed the value of the system.
Insufficient comfort during heat waves: Older systems struggle during extended hot spells common in Silicon Valley inland valleys.
Noisy operation or excessive cycling: These point to mechanical wear, improper sizing, or control faults.
Poor indoor air quality or uneven temperatures: Duct issues or lack of zoning can make some rooms uncomfortable while others are over-conditioned.

System evaluation: what a thorough assessment covers

A professional evaluation identifies whether repair or replacement delivers the best value and ensures the new system is properly specified:

Visual inspection of indoor and outdoor units, ducts, filters, registers, and refrigerant lines.
Age and service history review to assess remaining useful life.
Performance testing: airflow measurements, refrigerant charge evaluation, and electrical load checks.
Energy-use analysis comparing current utility costs to projected savings with a modern system.
Ductwork inspection and duct leakage testing where applicable.
Home envelope review: insulation and window condition can affect heat pump sizing and performance.

Equipment selection and sizing for Los Altos homes

Proper equipment selection is essential for comfort and efficiency. Key considerations:

Correct sizing (Manual J load calculation): Oversized or undersized units lead to short cycling or inadequate comfort. A Manual J calculation accounts for Los Altos climate, home orientation, insulation, and window area.
Efficiency ratings: Look at SEER (cooling) and HSPF or COP (heating) values. Higher ratings yield lower energy bills, especially valuable during hot summers and mild winters.
Types of heat pumps:
Air-source heat pumps: Most common and cost-effective for Los Altos.
Ductless mini-splits: Ideal for older homes without ducts or for zoning problem rooms.
Cold-climate heat pumps: Consider if heating demand is higher than typical for the area.
Variable-speed compressors and inverter-driven units: Provide better humidity control, quieter operation, and higher seasonal efficiency than single-speed systems.
Matched systems and controls: Ensure outdoor and indoor components are compatibility matched; upgraded thermostats support zoning and smart scheduling.

Energy-efficiency options and comfort features

Upgrading gives an opportunity to improve whole-home performance:

High-efficiency units with inverter technology
Zoned systems or multi-zone mini-splits for individualized comfort
Heat pump desuperheater or integrated hot water heat recovery for additional efficiency
Variable-speed fans and ECM blowers for consistent airflow
Improved filtration and UV or whole-home air cleaners to enhance indoor air quality
Smart thermostats and controls to optimize runtime and savings

Removal and disposal of old equipment

Proper decommissioning protects the environment and ensures code compliance:

Refrigerant recovery: Certified technicians must recover refrigerant in accordance with EPA regulations.
Recycling of metals and proper disposal of oils, capacitors, and electronic components
Documentation of disposal for permit closeout and potential rebate eligibility

Permitting and inspection in Los Altos, CA

Heat pump replacement typically requires a building permit from the City of Los Altos. Expect the process to include:

Permit application detailing equipment type, efficiency ratings, and scope of work
Compliance with California energy codes and local ordinances
Electrical permits for new or upgraded service required by the utility
Final inspection to verify correct installation, safety, and code compliance
Special considerations: some historic neighborhoods or development zones may have additional requirements

Rebates, incentives, and financing guidance

Replacing a heat pump can be more affordable with the right incentives:

Federal tax credits and state-level incentives for energy-efficient heat pumps may apply
Local utility rebates, such as those offered through PG&E and regional programs, often cover high-efficiency equipment or heat pump water heaters
Financing options may include HVAC financing programs, home energy loans, and PACE financing in eligible areas
Documentation typically required for rebates: equipment model numbers, AHRI certificates, invoice, and proof of permit and final inspection

Post-installation testing and warranties

A quality installation includes thorough commissioning and clear warranty information:

Commissioning steps: refrigerant charge verification, airflow balancing, thermostat calibration, system cycling tests, and duct sealing where applicable
Performance verification: measured indoor temperatures and system COP/SEER checks
Warranty types: manufacturer parts and compressor warranties and installer workmanship warranties. Keep copies of equipment manuals, warranty cards, and commissioning reports.
Maintenance recommendations: annual tune-ups, filter replacement, keeping the outdoor unit clear of debris, and monitoring system performance to preserve efficiency and warranty coverage

Long-term benefits and maintenance advice

Replacing a heat pump brings immediate comfort and long-term value: lower utility bills, improved humidity and temperature control during Los Altos heat events, fewer emergency repairs, and reduced carbon footprint. To protect your investment:

Schedule annual preventive maintenance
Change filters regularly and keep airflow unobstructed
Address duct leaks and insulation upgrades when practical
Monitor energy use after replacement to confirm expected savings

A properly evaluated, sized, permitted, and commissioned heat pump replacement aligns equipment performance with Los Altos living conditions. Thoughtful equipment selection, attention to efficiency features, and adherence to local permitting and environmental requirements deliver reliable comfort and measurable savings.

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.

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