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About Us

Jim’s Air systems is family owned and operated by Joshua Arellano in Oakley California. The company was founded in 1978 by Joshua’s father James Arellano in Oakley California. They specialize in heating and air conditioning systems for custom homes, residential replacements, room additions, Commercial installation, and Solar PV electric systems.

Who We Serve


Contact Us Today For Residential in Concord, Pleasant Hill, Walnut Creek, CA and surrounding areas


Contact Us Today For Commercial in Concord, Pleasant Hill, Walnut Creek, CA and surrounding areas

New Construction

Contact Us Today For New Construction in Concord, Pleasant Hill, Walnut Creek, CA and surrounding areas


Wayne S.

2:00 pm on June 19, 2017, the fourth day of 100+ degree days, the air conditioner quit. I called the usual repair services and they …

Marla J.

I had a company diagnose my a/c unit as a bad compressor and said it would cost over $2,000 to replace. Josh from Jim’s Air …

Monica S.

I had Jim’s do a heater repair for me and his response was very swift. He came out the same day and fixed it with …

Ronan W.

I don’t have any additional comments for this professional.

Mark W.

HVAC installed in a timely and professional manner.

Judy C.

Josh was prompt, professional and he & his crew did an excellent job.

Daniel G.

very honest. Didn’t try to sell me stuff I did not need.

Ilhong Y.

HVAC installed as described and the crews do their job perfectly.

Michael E.

This company is awesome. Work ethic is impeccable. Great communication. Josh(owner) worked with us the whole way. We purchased a Heating and AC unit along …

David G.

Jim gave us a good job

Stephen C.

Fair price for heater and AC. Smooth as silk installation . Personable and intelligent installation team. Fine cleanup. Could not ask for more !

Sterling T.

Joshua and his team were great! I told him I want honesty and quality! That is exactly what he gave me and he threw in …

Edward K.

Courteous, knowledgeable, efficient. Used their experience to work around potential installation problem, saving us time and $$$$. Highly recommended.

Janice C.

Josh spent a lot of time with us, and came over twice before doing any work. He is great to work with and was more …

Anne S.

Excellent advice, cheerful, efficient, cleaned up after.

Torrie W.

I interviewed 5 companies before deciding on Jim’s Air Systems. I found the owner Josh very knowledgeable and willing to answer all my questions of …

Tom O.

Any question I sent Joshua via email was answered quickly. He gave great advice and even helped with PACE financing. They replaced my AC compressor, …

Michelle S.

He was very friendly, honest, and upfront. Very knowledgeable and informative on what it was that he needed to do.

Ofelia A.


Jimmy J.

Everything Excellent!

Diane L.

I will have them do many project done the road when time comes.

Nima T.

On-time, clean, professional, and did the job quickly, on budget. Thank you!

Dennis S.

Don’t go with Costco, Jim will give you better price .

Durwin S.

Very responsive. Family owned. Owners personally involved. Best pricing, Clean job. Great follow-up. Always looked for ways to keep quality up and pricing at a …

William (bill) R.

very prompt communications

Dan D.

Jim and his workers are very polite and on time.

Shantell H.

Joshua from Jim’s Air Systems followed up with quotes and options over multiple conversations, was very knowledgable, and got the work done very fast. Would …

Scott D.

Amazing job at a great price. Very professional and clean workers.

Jeanette B.T

The best around!..Fast service…honest quotes!

Eileen R.

Jim’s Air Systems provides high quality service at a reasonable price! They are incredibly dependable and efficient!!

Tom V.

Found Jim’s Air Systems by accident. Joshua’s son and my son played on the same baseball team. Joshua came to my rescue twice. Once when …