Plum HVAC explains when a full air conditioning replacement is recommended for Los Altos homes, how our technicians evaluate aging systems, and how to select energy-efficient, properly sized equipment. We cover removal, disposal, permits, rebates, and financing options, along with installation timelines, post-install testing, and warranties. Emphasis is placed on accurate load calculations, SEER-focused choices, duct considerations, and smart thermostats to maximize comfort, savings, and compliance with California energy codes. Plum HVAC also highlights maintenance tips to sustain efficiency long-term.

Air Conditioning Replacement in Los Altos, CA

Schedule My Service

(650) 605 – 5986

Air Conditioning Replacement in Los Altos, CA

Replacing an aging or failing air conditioning system is one of the most effective ways to improve home comfort, reduce energy bills, and meet California efficiency requirements. For homeowners in Los Altos, CA, where summers are warm and cooling demand can spike during heat waves, choosing the right time and the right equipment matters. This page explains when a full AC replacement is recommended, how a professional evaluation is conducted, how to choose the correct and energy-efficient system, and what to expect during removal, permitting, installation, and post-install testing.

When a full AC replacement is recommended

Common indicators that an Air Conditioning Replacement in Los Altos, CA is the best option:

System age 12 to 15 years or older with declining performance.
Frequent compressor failures or recurring major repairs.
Rising energy bills despite regular maintenance.
Inability to maintain consistent indoor temperature and humidity.
Use of R-22 refrigerant or other phased-out refrigerants.
Home renovations or additions that change load requirements.

Los Altos homes often have older duct systems and attic heat loads that make older systems work harder. Replacing an outdated unit can restore comfort and prevent emergency breakdowns during peak summer demand.

Evaluation process: how we determine replacement vs repair

A thorough evaluation focuses on three main factors: system age and condition, seasonal efficiency, and repair history.

Visual and operational inspection: check compressor, coils, electrical connections, and refrigerant lines.
Review repair records: note frequency, cost, and nature of past repairs to gauge remaining life expectancy.
Performance testing: measure airflow, refrigerant charge, and temperature split to assess cooling effectiveness.
Efficiency assessment: compare measured performance to rated SEER and Home Energy needs.
Load calculation: perform a Manual J style cooling load calculation to determine required capacity for your specific Los Altos home, accounting for attic insulation, window orientation, and local climate.

This evaluation determines whether a targeted repair or full system replacement will provide the best long-term value.

Selecting energy-efficient models and correct sizing

Choosing the right equipment requires balancing efficiency, capacity, and compatibility with existing ductwork and home layout.

Sizing: Use a Manual J load calculation, not just tonnage per square foot. Proper sizing avoids short cycling, humidity issues, and excess wear.
Efficiency: Look for systems with higher SEER ratings and ENERGY STAR rated models. In Los Altos, higher-efficiency units often pay back faster due to summer cooling loads and local energy costs.
Heat pump options: Modern heat pumps provide efficient cooling and can also offer heating, which is advantageous for mild Los Altos winters and can meet state electrification goals.
Ducted vs ductless: Evaluate duct condition. If ducts are leaky or poorly insulated, a ductless mini-split or ducted replacement with duct sealing may deliver better overall results.
Controls: Upgrade to a programmable or smart thermostat for tighter temperature control and additional energy savings.

Removal and responsible disposal of old equipment

Removal is handled with care and regulatory compliance.

Refrigerant recovery: Certified technicians recover refrigerant per federal and California rules to prevent emissions.
Recycling: Metal, copper tubing, and other recyclable parts are separated and recycled per local requirements.
Disposal: Non-recyclable components are disposed of in accordance with City of Los Altos and Santa Clara County waste regulations.Proper disposal avoids fines and aligns with state environmental standards.

Permit and rebate assistance for Los Altos homeowners

AC replacements in Los Altos normally require permits and must meet California energy codes. Key considerations:

Permits: Most full-system replacements require local building permits and inspections to ensure compliance with state energy code and safety standards.
Title 24 compliance: New installations must comply with current California energy code provisions, which can affect equipment choice and installation details.
Rebates and incentives: Local utility and state programs often offer rebates or incentives for high-efficiency systems and heat pumps. Eligibility depends on model efficiency, installation details, and local utility participation.Professional installers typically help gather documentation and complete forms to maximize available incentives.

Financing options and cost considerations

Replacing an air conditioner is an investment. Typical financing options include:

Home improvement loans or personal loans.
Energy-efficient HVAC financing programs tied to equipment performance or rebates.
Deferred payment plans or low-interest financing from lenders that specialize in home energy projects.When evaluating financing, consider the expected energy savings and potential increase in home value when comparing options.

Installation timeline and what to expect

A straightforward air conditioning replacement generally follows this timeline:

Site evaluation and load calculation: 1 visit.
Equipment selection and permit application: 1 to 2 weeks depending on permit turnaround.
Equipment delivery: 1 to 2 weeks depending on model and availability.
Installation: 1 to 3 days for a standard split system replacement; longer for ductwork upgrades, structural changes, or full system swaps.
Inspection and final sign-off: scheduled through the City of Los Altos inspections department.

Installations in older Los Altos homes may require additional time for duct sealing, attic access, or electrical upgrades.

Warranties, post-install testing, and handover

Quality installations include multiple warranty layers and thorough testing.

Manufacturer warranties: compressors, coils, and parts often carry multi-year warranties. Verify coverage length and conditions.
Workmanship warranty: installers should provide a labor warranty on the installation work for a set period.
Post-install testing: technicians perform airflow, refrigerant charge, temperature split, and electrical safety checks. They also verify thermostat programming and zoning operation if applicable.
Documentation: installers should provide manuals, warranty registration assistance, and a summary of the work performed.

Expected energy savings and long-term benefits

Replacing an older AC with a modern high-efficiency unit typically reduces cooling energy use significantly. While savings vary by home, typical improvements include:

20 to 40 percent reduction in cooling energy for systems over 10 years old when upgrading to a high-SEER unit.
Improved comfort and humidity control.
Reduced repair frequency and fewer emergency service calls.
Potential increase in home resale value and improved indoor air quality if combined with duct sealing and filtration upgrades.

Factors affecting savings include the new system’s SEER, correct sizing, duct condition, insulation, and occupancy patterns.

Maintenance tips after replacement

To preserve efficiency and reliability:

Replace or clean filters monthly during heavy use months.
Schedule annual tune-ups to verify refrigerant charge, clean coils, and check electrical components.
Maintain clear airflow around outdoor units and keep attic insulation and ventilation in good condition.
Monitor thermostat settings and use programmable schedules to reduce unnecessary cooling.

A properly selected and installed replacement system will keep Los Altos homes comfortable through warm summers while reducing energy use and complying with local regulations.

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