Heating and cooling help in Port St. Lucie. Upfront pricing and a straight answer before any work starts.

“Mark DeJarnette was/is my role model on how to operate a successful HAVC buiness by cutting unnecessary overhead and passing the saveings on to his customers. A very honest hard working family man that does the projects on time and passes inspections from the building departments the first time. Won't find better.”

“This is for Larry W. I was pre-warned ahead of time about this call. Larry's wife must have been having a very bad day because upon answering the door she was in a tyrannical mood. She was rambling on about something that did not pertain to air conditioning. I tried to talk to her about what the problem was with her AC and she started yelling and screaming she was on the phone with her husband. I got out of there as fast as I could. Here is an update since then as of January 3rd 2026 the landlord has since then had me back to make the repairs. Landlord is very pleased with the repairs and will use us again.”

“⭐️⭐️⭐️⭐️⭐️ I had a very positive experience working with Mark. He communicates in a very intelligent and professional way, especially over the phone — he doesn’t just send you to get a quote, but actually listens carefully, understands the details, and shows real involvement in what needs to be done. Mark is easy to talk to, friendly, and very approachable. He clearly knows what he is doing and works efficiently and quickly while maintaining quality. His pricing is fair and reasonable, and he is open to discussion, which makes the whole process comfortable and transparent. If something needs to be adjusted or fixed, Mark handles it without any problems. He is flexible, professional, and genuinely easy to work with. On top of that, he offers discounts and completes the work promptly. Overall, Mark is not only a true professional, but also a very pleasant, fair, and reliable person. I highly recommend working with him.”