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The Evolution of the Air Conditioner

July 20, 2015

The Evolution of the Air Conditioner

We might not think much about how easy it is to turn down the temperature on our thermostats and enjoy cool, conditioned air. At one time this “luxury” didn’t exist! We go back in time to follow the invention of the Air Conditioner down thru history to our modern day. Check out our latest, fun infographic!

Infographic that shows the evolution of air conditioning throughout history

About The Author

Bob Jenson

For over 45 years, Bob Jenson has been providing quality heating and air services to the San Diego community.

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Based on 990 reviews

Bob Jenson Air Conditioning and Heating

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1745094736

Extremely helpful!!
Javier Zambada
Abraham Brito 10/17/2024

Larry Stufkosky

1745084830

Very professional service, verified unit in top condition.

1745080785

Very thorough and nice. Very careful

1745030084

Thank you for your excellent staff especially Marcella Gorghis who answers questions and concerns with clarity offering other services and recommendations to maintain your high standards of trustworthy service. Also thanks as well to Cyrus your technician who provided in home maintenance and troubleshooting my system. He is also a reflection of Bob Jensons commitment to the community of unparalleled quality and trust. Thank you again I will continue to appreciate and use your services . Sincerely, C.Granot. Today 4/18/25 your wonderful tech Sal Castro did annual check of AC equipment and function he answered questions and clearly explained coverage and benefits of maintaining service contract. Also a shout out for Marcella who always rocks keeping all of us on track. Thank you Bob Jenson your the best. Mrs.G.

Ofelia Martinez

1745009993

I recommend pouring. he did an excellent job.

Ann Butterfield

1744999426

I've enjoyed Bob Jenson's HVAC maintenance plan for years and greatly appreciate how professionally & respectfully Pouria & Conner provided my recent service. They were thorough, detailed & fun! Thank you!

1744941970

As always they did a wonderful, quick, and efficient job!

1744912639

They provided an annual service for our air conditioner. Service was very competently and thoroughly performed by Carlos with assistance from Jack. They arrived right on time, as usual, and were very considerate and hard working.
Carlos was a wealth of information and was able to answer all of my questions. Bob Jensen Heating and AC have been providing maintenance, service, and repairs for our units for many years, and I have always found them to be very competent and exceptionally pleasant/helpful to work with.
I would highly recommend their Comfort Club Maintenance Plan. It is a good way to ensure regular annual maintenance for your furnace and air conditioner and a very cost effective way to get help and repair service when needed.

1744907411

Sal was excellent! He’s very thorough, communicates extremely well, and has a polite demeanor. Jensen is great!

1744842118

Bob Jensen’s techs have installed our A/C unit and subsequently have maintained it several times. Salvador completed a maintenance service today. This is the second time he has serviced it and he is excellent. From his demeanor, respect and knowledge he has become our preferred technician. We will continue to use Bob Jensen with their professionalism and excellence.

1744833823

I am very pleased with our 4-year-old Fujitsu 3-zone Mini-Split heat pump system installed and serviced by Bob Jenson Air Conditioning and Heating. The mini-split has proved to be an excellent economic addition to our 1980 starter condo.

I am also appreciative of and recommend the Bob Jenson extended warranty plan that provides for twice per year service calls.

Marcella Gorghis does an excellent job of scheduling the maintenance visits with friendly telephone calls and follow-up E-mails that provide a picture of the 100% drug free, background checked, safety and professionally trained Bob Jenson technician that is scheduled.

Today our Technician was Jeremy Zavala. Jeremy did a very thorough and professional job in his seasonal system maintenance for cooling. He wore booties over his shoes while working inside.

He checked each of the 3 wall units and the compressor and checked the operation of the system from the remotes. He removed, cleaned and re-installed the filters. He also inspected and cleaned the condensation lines and checked the 2nd floor pump operation. He inspected the blower wheels, coils, and control boards. He checked fuses, compressor, condenser fan motor, and capacitor. He tightened both the high and low voltage connections. Finally, he hosed off the coils of the outside compressor which had gotten dirty from the adjacent alder trees.

I highly recommend the Fujitsu Mini-split and Bob Jenson Air Conditioning and Heating.

3-10-22 Update
Our now six year old Fujitsu system developed a very, very slow leak in the refrigerant over the past year. Since the leak started just as the 5 year extended warranty expired, Bob Jensen fixed it - parts and labor - at no additional charge. Today Senior Technician, Tom, came out took care of everything. He is very knowledgeable, skilled and professional. I greatly appreciated his thoroughness and am appreciative of the Bob Jenson Company. I highly recommend them.

9-15-22 Update
Today, service technician, Roy Villa, came out and repaired our compressor unit. Due to a fluke electrical issue, all of the refrigerant had leaked out so the air conditioning quit working. Roy put booties over his shoes before entering our unit and immediately diagnosed the problem. He was polite, highly competent, very thorough, and professional. Roy quickly made the repair and his company honored the 10-year manufacturers warranty. After the repair, Roy carefully inspected all 3 wall units and cleaned the filters. I highly recommend Bob Jenson Air Conditioning and Heating.

10-3-23 Update:
Marcella Gorghis, Client Services Coordinator for Bob Jenson Heating and Air Conditioning, recently reminded me that it was time to do a semi-annual maintenance routine on our more than 7 year old Fujitsu 3 zone mini-split. As always, she was friendly and professional. After verifying that the date she suggested was good for us, Marcella provided a follow-up E-mail with a picture of the technician that would be coming out. That turned out to be Cyrus Thomas. Cyrus was also friendly and profession as well as very thorough today. He checked the electrical connections for all of the wall units and the compressor. He also thoroughly cleaned all of the filters and checked the remote controllers. I highly recommend Bob Jenson Heating and Air Conditioning!

04-16-25 Update
Today, Sal Castro came out and did a very thorough and professional job in his seasonal system maintenance for cooling. He wore booties over his shoes while working inside.

He checked each of the 3 wall units and the compressor and checked the operation of the system from the remotes. He removed, cleaned and re-installed the filters. He inspected the blower wheels, coils, and control boards. He checked fuses, compressor, condenser fan motor, and capacitor. Finally, he partially disassembled and thoroughly hosed and cleaned the outside compressor which had gotten very dirty from the adjacent alder trees. Sal is a true asset and credit to Bob Jenson Air Conditioning and Heating.

1744826293

He did great, courteous and did a great all around job.

1744761463

Pouria was thorough and friendly. Nice young man. He explained everything to us well. He went the extra mile to make sure everything was checked and didn't rush. It sounds like he likes what he does. Bob Jenson should be proud. Don't lose him. He's a keeper.

1744757913

April 2025
Pouria is a great employee...friendly, courteous, and smart. He completed our annual AC check and worked hard to get it clean. He explained everything thoroughly and was very respectful. In a world that lacks friendliness and customer service, Bob Jenson is doing it right!

Roger Scheuerman

1744739943

He did a good job and was very polite

1744734724

I called on Bob Jensen Air Conditioning & Heating to replace my aging system in 2004. Just by changing filters regularly, I got 17 years of use out of that system without the need of a single major repair. In 2021, it was time to upgrade again, and I felt that Jensen earned my repeat business. The company upgraded my equipment, guided me to a modern thermostat that I can easily control from my smartphone and helped me replace what, to my horror, was a now-crumbling attic duct system made of asbestos. I trust Jensen’s professionalism and quality customer service. I also like supporting local businesses. They back quality products built to last. This time around, I even signed up for its twice yearly maintenance check service. It’s a luxury, but I like the peace of mind it affords.

Betty Riseflores

1744676954

As always, excellent service and staff. Javier is very knowledgeable and professional and friendly and a pleasure to have in my home.

1744668187

It's been a pleasure working with Bob Jenson AC and Heating. They added AC to our existing system last year and everything has gone smoothly. Their service and responsiveness is top notch, no complaints!

1744485059

Javier was my technician today. He was so impressive as a tech. Did everything correctly and efficiently. He was also kind and helpful. He explained everything that he was doing as he went. He made the maintenance process smooth. I truly appreciated everything he did for me. He is an incredible asset to the Bob Jenson organization.

1744484852

Sal, as usual, excelled. His knowledge of the equipment makes you know all is well.
Thank you all very much.

1744465822

Javier was very thorough and went over everything he did.
Great service and very professional young man@

Reginald Colotario

1744405052

Sal and Uz did a good job checking our AC and heater. They were thorough and friendly.

1744404361

Nice professional person. Javier
Explained what he did to the units
Thanks

1744402227

Great experience with Marcos and Tom!! They were friendly, professional and thorough in explaining the issues with my heater and the pricing to fix the problem. The turnaround time to get a new unit is also fantastic. I am pleased I found this company. Would highly recommend.

1744392987

Sal and Uz did a great job providing the routine maintenance on our Bosch mini-split! They arrived on time, were extremely courteous, worked efficiently and answered all of my questions about the system.
Thank you.
Richard Erhard
Alpine, CA

Jacqueline Dominguez

1744135417

Bob Jensen has been maintaining our HVAC system for many years and we are always pleased with the service they provide. Sal serviced our system today. He's very knowledgeable, friendly and thorough. We are happy with the system that they installed and maintain and will continue to use them for our annual maintenance.

Christen Kugener

1744050762

I love Marco at Bob Jenson : she has been my go to point at Bob Jenson for years now and delivers excellent service. All in all good business : they handle the AC in both my house and my business

1743881942

Edit: Follow up visit
Technician Pouria Z. came out for a scheduled maintenance call. Found some issues and explained what needed doing. I respect the honesty in the advice. Fast and friendly service. I will ask for him again next time.

I had booked an appointment a week out, but they had a cancellation earlier in the week and called to see if I would like that open appointment. It was great. The technician was on time, explained things VERY thoroughly to me so that I could understand what the last installation had done poorly, and how I could remedy the situation. Was very good at showing me what he was doing and explaining why it needed to be adjusted. I had used a different company for a home warranty repair, and it had awful results so I was hesitant to try and repair this on my own. Thanks to Angie's List and the company's reputation and reviews I feel I got quality service for a reasonable price. I would highly recommend Bob Jenson to anyone who needs AC repairs.

1743809231

Great service on mini split by sal today

1743690204

5 stars for abrahams's service on Thursday March 27 & Friday March 28, 2025

1743633929

Installed a Rheem heating unit and Bosch AC outside unit to replace existing older system that was leaking slowly. Competent and professional. Great attention to detail and better value for money over big box places or those you see advertising about white gloves on TV all the time! This is the 2nd system I have purchased from them and recommend them to anyone who asks without hesitation. Thanks guys!

Update: Had both units serviced today 4/2/2025 by Jack and Javier. Great service as usual. Systems are running great and learned some things about fuses and float switch diagnostics for fun! Thanks guys!

Update: Had both units serviced today 9/5/2023 by Cyrus. Great work as usual. Systems are running great!

Update: Pouria serviced system today. Found issue and worked thru it. Great service as always. Thanks!

1743538005

Just had Sal here to do my AC maintenance.
He was very professional, friendly & knowledgable. Also he was very honest with his recommendations as I have a combination heater/ ac purchased from Bob Jensen in 2012. Thank you Sal.

1743532283

Michelle Chapman

1743526137

Marcos is fantastic. As he came in to my home he let Uz know that despite having a loud bark my dog was friendly & how best to interact with him while I had my dog in the crate at the start of the appointment. Marcos was also very quick in updating the settings on my thermostat so that it recognized a recent service that it hadn’t previously so that I wasn’t receiving unnecessary services.

1743284812

Pouria just left our home for the maintenance, and he did a wonderful and extensive exam of our heating and air conditioner.

Geri Breininger

1743198728

During our yearly inspection done by Bob Jenson Tom noticed a leak in our coils. We talked over the cost to find and fix the leak and decided to go with a new AC unit since ours was 15 years old. The paperwork was done that day and it was scheduled for the next day. Oscar,Jorge,and Brian were here bright and early. They laid down drop clothes and started. They were professional answering all question. They did a wonderful job and left the site cleaner than when they arrived. I would highly recommend them.

1743110874

Pouria from Bob Jenson AC made a maintenance service call today. He was outstanding! Polite, thorough, knowledgeable. Highly recommend.

1742858516

1742847642

Great and professional job by Luis Garcia and Jorge Curiel on installing new Ducts and replacing all the vents in the house! Connor Higgins Technician inspected our old Ducts and Vents and advise us to change to upgrading the ducts/vents sizes to increase air flow. Easy to work with and no pressure from Connor. Very happy with the results! We highly recommend! Thanks for the great Job and follow up after installation!!

Mommie Gallardo

1742837925

Pouria Ziari was courteous and professional as well as technically sound, as he serviced our Air Conditioner unit and inspected peripheral ducts. We recommend his technical expertise!

1742580370

The experience from scheduling the initial visit with Megan through the installation visit with Mike were excellent. Mike explained all the possibilities and offered suggestions that would best suite the installation. I had three companies visit and the Bob Jensen team was the most professional experience.

1742504464

Conor and Pouria came and did an amazing job on my Dads old furnace. They were so respectful and courteous. Very professional. They were able to service the system and took pictures of the unit from inside to show me small issues.
I have been using Bob Jenson for 20 years and they know what they are doing. I highly recommend!

1742491444

Pouria Ziari serviced our furnace yesterday, and it was a positive experience. He listened to and answered our questions, described what he would be doing, did the work, shared photos of the work. He was warm and engaging and wore shoe coverings to protect our floors. Many thanks!

1742405217

I've been a customer since 2021. Most recently, I needed to have the ducts replaced as they were clearly showing their wear and tear. Antonio and Abraham from the team were the 2 professionals who took care of the work. They arrived within the window, gave me frequently updates throughout the day on what they did, and showed me pictures and video on all the replacement. The airflow is so much better and the house heats very quickly. I can't thank the team enough for their professional and thorough service.

1742394119

Conor and Pouria - they rock! Two thumbs up. Great customer service!

1742339309

Pouria was just here to do a seasonal check up on AC. He is the best !

1742242385

Sal and Uz just completed a system check-out. Both gentlemen were extremely polite, courteous and efficient. Explained everything they were doing and, when complete, gave a thorough status review of our system and answered all our questions. We have used Bob Jenson several times over the past few years, including the installation of a new heat/ac pump last year. We will continue to use them forever!

Susanne Chambers

1741995837

Pouria was here this afternoon and was very professional and polite. Very nice young man

1741987268

Pouria is Very professional Service performed impeccably by a very nice to work with tech who explained the work undertaken before he left

1741916148

Pouria did an amazing job today. Very professional and will recommend this company to all my neighbors

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