We really lucked out when we found Shai! He has serviced our AC many times over the years. He responds very quickly and has even suggested things over the phone (or email) that we can try first in case a service call isn't needed. He is very honest and his rates are reasonable. Super nice guy, always pleasant. Very punctual too. We have been very happy with his service and highly recommend him to others. AAA+++
Ellie Casson
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November 12, 2025
We hired Highland Air in 2023 to install a new HVAC system during a home remodel, and unfortunately, we cannot recommend them. Less than two years after paying over $10,000 for a “brand-new” system—and after ongoing issues from the start—we had to replace the entire unit for another $6,500.
Highland Air's owner, Shai Zimon, consistently did poor quality work, was unable to diagnose/fix problems thoroughly, and avoided true accountability for problems that his poor workmanship created. From the day of installation, we noticed problems: the outdoor condenser was so unstable it wobbled when touched—concerning since we have small kids who play nearby. When we asked him to fix it, he said he didn’t have the tools or staff to re-level it.
The wiring between the indoor and outdoor components was messy and insecure—another HVAC technician later called it “unbearable.” That shoddy work likely caused early communication failures between the thermostat and system, causing the condenser to run perpetually but without actually cooling the house. We had to shut it off to prevent it from icing over and breaking. Mr. Zimon’s fix was to tell us to “flip the breakers” whenever the system stopped responding—something we had to do repeatedly moving forward to keep our system running because it would inexplicably shut off at least twice a week.
During the intense heat of this past September, our HVAC system finally failed completely. Mr. Simon came to assess the situation (at no cost, I will say). He determined that the outdoor unit likely a freon leak but couldn’t find or repair it. His solution was to offer to refill the freon for $800, though he said the freon would likely leak out quickly and we'd be right back where we started. We declined because we didn't want to dump money into a broken unit and temporary solution. When we talked with him about getting help from the manufacturer or distributor by calling their tech or pursuing the warranty for the unit, he said dismissively, "good luck with that". He left that day with no proposal for how we should proceed, with the unit open, and parts scattered on the ground. He told us that his one-year labor warranty on our project had expired and so was under no obligation to fix these issues unless we were to pay him. At this point, we felt sure that even if we were inclined to pay him to continue to pursue repairs, he wouldn't be able to actually fix the problem.
This alternative HVAC professional quickly found the real issue—a cracked copper coil deep inside the condenser. The location of the coil made the entire Gree Flexx unit unrepairable. Further, this particular unit is no longer being manufactured. So, the only real way to exercise the unit's warranty protection was to request a refund for the original cost of the outdoor unit. We had to rely on Mr. Zimon to submit a warranty claim, since only the original contractor could do so. Mr Zimon only followed up if we prodded him or made it easy by providing language from the other HVAC professional on the details of the problem that he could pass along. When the supplier ultimately declined our request for a refund, saying that they were only obliged to send us the useless replacement part, Mr. Zimon told us he was done dealing with our situation.
In the end, we were left with a broken, discontinued HVAC system and a $16,000 loss. We’re sharing our experience so others can avoid the same stress, expense, and frustration.
(A note on the other HVAC professional that we brought on. Unlike Mr. Zimon, this technician was able to quickly diagnose and fix our HVAC system's problems. He spent hours calling suppliers, refilled our freon for free to get us through a heat wave, and treated us with genuine care. At his request, we are not mentioning his name. It's important to mention his role though, because it shows the stark contrast between the capability and integrity of the two men.)
Craig Koellhoffer
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August 23, 2025
Shai the owner of Highland Air is extremely knowledgeable, about HVAC systems, and his pricing for installation for these systems is very reasonable. We were doing a room addition of course the time-line for scheduling work needs to be flexible, and Shai and his team met the challange. Shai provided reference which supported his description of the equipment we purchased, and with the complete system including new ducting for our addition being installed today, we are completely satisfied with our decision to use Highland Air.
Azadeh Desuse
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November 29, 2025
Honest and professional company. Shai is very knowledgeable and helped us decide which HVAC system to install. He’s very responsive, works fast and reliable. Highly recommend.
Julie M.
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November 12, 2025
Our old beat-up A/C condenser was on the fritz, I called around and we ended up getting 3 estimates. Getting estimates is not one of my favorite things to do so after meeting two contractors I had already had enough.
Called ONE MORE and found Shai from Highland Air. Shai ended up being our #1 choice not only because of his knowledge and professionalism, but also because he is so friendly and kind.
Can’t recommend Highland Air enough, thank you Shai!
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638 Lindero Canyon Rd, Oak Park, CA 91377, USA
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We really lucked out when we found Shai! He has serviced our AC many times over the years. He responds very quickly and has even suggested things over the phone (or email) that we can try first in case a service call isn't needed. He is very honest and his rates are reasonable. Super nice guy, always pleasant. Very punctual too. We have been very happy with his service and highly recommend him to others. AAA+++
We hired Highland Air in 2023 to install a new HVAC system during a home remodel, and unfortunately, we cannot recommend them. Less than two years after paying over $10,000 for a “brand-new” system—and after ongoing issues from the start—we had to replace the entire unit for another $6,500. Highland Air's owner, Shai Zimon, consistently did poor quality work, was unable to diagnose/fix problems thoroughly, and avoided true accountability for problems that his poor workmanship created. From the day of installation, we noticed problems: the outdoor condenser was so unstable it wobbled when touched—concerning since we have small kids who play nearby. When we asked him to fix it, he said he didn’t have the tools or staff to re-level it. The wiring between the indoor and outdoor components was messy and insecure—another HVAC technician later called it “unbearable.” That shoddy work likely caused early communication failures between the thermostat and system, causing the condenser to run perpetually but without actually cooling the house. We had to shut it off to prevent it from icing over and breaking. Mr. Zimon’s fix was to tell us to “flip the breakers” whenever the system stopped responding—something we had to do repeatedly moving forward to keep our system running because it would inexplicably shut off at least twice a week. During the intense heat of this past September, our HVAC system finally failed completely. Mr. Simon came to assess the situation (at no cost, I will say). He determined that the outdoor unit likely a freon leak but couldn’t find or repair it. His solution was to offer to refill the freon for $800, though he said the freon would likely leak out quickly and we'd be right back where we started. We declined because we didn't want to dump money into a broken unit and temporary solution. When we talked with him about getting help from the manufacturer or distributor by calling their tech or pursuing the warranty for the unit, he said dismissively, "good luck with that". He left that day with no proposal for how we should proceed, with the unit open, and parts scattered on the ground. He told us that his one-year labor warranty on our project had expired and so was under no obligation to fix these issues unless we were to pay him. At this point, we felt sure that even if we were inclined to pay him to continue to pursue repairs, he wouldn't be able to actually fix the problem. This alternative HVAC professional quickly found the real issue—a cracked copper coil deep inside the condenser. The location of the coil made the entire Gree Flexx unit unrepairable. Further, this particular unit is no longer being manufactured. So, the only real way to exercise the unit's warranty protection was to request a refund for the original cost of the outdoor unit. We had to rely on Mr. Zimon to submit a warranty claim, since only the original contractor could do so. Mr Zimon only followed up if we prodded him or made it easy by providing language from the other HVAC professional on the details of the problem that he could pass along. When the supplier ultimately declined our request for a refund, saying that they were only obliged to send us the useless replacement part, Mr. Zimon told us he was done dealing with our situation. In the end, we were left with a broken, discontinued HVAC system and a $16,000 loss. We’re sharing our experience so others can avoid the same stress, expense, and frustration. (A note on the other HVAC professional that we brought on. Unlike Mr. Zimon, this technician was able to quickly diagnose and fix our HVAC system's problems. He spent hours calling suppliers, refilled our freon for free to get us through a heat wave, and treated us with genuine care. At his request, we are not mentioning his name. It's important to mention his role though, because it shows the stark contrast between the capability and integrity of the two men.)
Shai the owner of Highland Air is extremely knowledgeable, about HVAC systems, and his pricing for installation for these systems is very reasonable. We were doing a room addition of course the time-line for scheduling work needs to be flexible, and Shai and his team met the challange. Shai provided reference which supported his description of the equipment we purchased, and with the complete system including new ducting for our addition being installed today, we are completely satisfied with our decision to use Highland Air.
Honest and professional company. Shai is very knowledgeable and helped us decide which HVAC system to install. He’s very responsive, works fast and reliable. Highly recommend.
Our old beat-up A/C condenser was on the fritz, I called around and we ended up getting 3 estimates. Getting estimates is not one of my favorite things to do so after meeting two contractors I had already had enough. Called ONE MORE and found Shai from Highland Air. Shai ended up being our #1 choice not only because of his knowledge and professionalism, but also because he is so friendly and kind. Can’t recommend Highland Air enough, thank you Shai!