All reviews for Karalis Mechanical Services, LLC.

Great communication and professionalism by the whole crew from start to finish. I would highly recommend them.

KMS Services has exceptional customer services, and I would recommend them to everyone and anyone in the tri-state area! My AC unit was having issues and was not cooling down my house during our mini heat wave last week. I called Paul and left a voice message, he quickly returned my call and had someone at my house within the next few hours. He and his staff are extremely friendly, knowledgeable, and reliable!

Karalis has been wonderful! They are an honest family owned company who recommend what you need and not what costs the most! We started using them when we had them install our HVAC system. That’s a large purchase and Karalis helped us every step of the way! Since then they service our system each year. Most recently we had them install an ecobee thermostat for us, which we love! I cannot say enough good things about Karalis. We have used many other competitors and no one compares to Karalis. They are the best in the biz. We highly recommend them.

Karalis Mechanical was able to get my specs, and schedule my replacement in a very timely manner just in time for the upcoming heating system. The installers were great. Very professional, clean and unobtrusive. They insisted on putting down tarps and when they left you could not even tell they were here except for the beautiful installation they left behind. Thanks for the great job guys.

In early February of 2023, our oil furnace was failing after 16 years of outstanding service. We wanted to convert to gas and decided to upgrade the whole system. We would also need to have the oil tank removed and a new gas line for new furnace. We called several contractors for cost estimates. Last call went to Karalis Mechanical Services LLC in Broomall. Paul Karalis came over to my house and discussed options that would fit my budget and make my home extremely comfortable. On March 14th, Paul and his crew installed the new gas heating furnace, A/C unit, thermostat, gas line and removed the oil tank all in one day. Very professional and knowledgeable staff. They cleaned up my basement after installation and explained all the new equipment system operational conditions. My wife and I were very pleased at what Paul Karalis and his crew did for us!
If you want it done right call Karalis Mechanical Services!!!

Karalis has now serviced my office for 2 years and they have been great to work with. They are very easy to work with and all work has been done as promised, on time and within budget.

Talk about a great company to work with! I contacted Paul for a new heating & air system in my home and Paul had me accounted for the following week. If you're looking for a reliable, reputable, and cost efficent company to work with KMS should be your go to! KMS's first estimate was more competitive then 5 other HVAC companies I had bid the job. Highly Recommend!

I had a brand new HVAC system as well as a whole house generator installed back in Dec. 2019. It has turned out to be the best investment I ever made! I never need to worry about power outage anymore. The HVAC delivers a remarkable improvement of indoor air quality during both the heating and cooling seasons.

Karalis service has been outstanding! They always arrived on time and got the job done, and responded to a couple of my unscheduled service calls expeditiously. Their prices are competitive in comparison to a major local service provider I had used for the previous 15 years before I switched over.

Paul and his team were excellent. He made the entire process smooth and worry-free as we are first time homeowners. The installation went great and we’re now enjoying our new HVAC system. I will use Karalis Mechanical Services, LLC for all my future HVAC needs. Thanks Paul!

Our furnace stopped working suddenly and it is not that old. After calling, it was fixed within 3 hours. From the beginning until the end, everyone was helpful, friendly and professional. They were on time from the estimated timeframe. Paul was kind and explained the issue in terms I would understand since I am not in the HVAC business. The cost was also affordable and reasonable. We plan to continue to use Karalis in the future.

I would highly recommend Karalis for future work. They provided very quick and responsive service and installed a new heater and air conditioner at a competitive price. Each step of the process was professional and friendly. Will definitely use them again!

I was very pleased with the installation and pricing of a new air conditioning system for my home. The installation team was friendly and professional, the work was neatly done, the premises were left in pristine condition on completion, and the operation of the system was explained fully. Great customer service...I highly recommend Karalis!

Paul gave us a great price and was able to install our new HVAC unit quickly so we didn't have to suffer in the summer heat!

I have an older ac unit and thought the worst when we had a problem. I called them this morning and they were here by the afternoon. I was expecting to hear the same story I've heard before. Old unit, freon no longer available, going to need a whole new system. Not Paul, he looked over the system, topped the refrigerant, and even changed the filter for good measure. I couldn't have been happier with the service or more relieved he didn't try to talk me into something I didn't need yet. I asked about full replacement and he gave me a rough number and future outlook but didn't pressure me at all. I intend on using them for all my future mechanical needs.

We were experiencing heating issues on one floor of our house, we have multi-zone heat and AC. The guys from Karalis Mechanical came out and diagnosed the problem. They wrote up a proposal and we did get quotes from two other contractors and Karalis had the most competitive proposal. The installers were friendly, neat, and efficient. The entire house is comfortable and maintains perfect temperatures. The owner is very friendly and always followed up on any work performed via call or text. The over all experience was positive and we strongly recommend Karalis.

Started using Karalis about 2 years ago for both of my restaurants for refrigeration and HVAC. Paul and his team do a great job of preventing issues through regular maintenance. If there is an issue they are quick to respond, fix the issue and explain it in a way that makes sense . Couldn’t be happier with Karlalis !!

Paul and his staff are amazing. After many calls to various companies, I called searching for my best option for split units or a new heating/AC system all together . Paul came over to take a look the same day. Thoroughly explained everything to me. He is a good, honest, hard working man and that is very hard to come by these days. I look for companies to build a relationship with and continue to use and I have found that with Karalis Mechanical. They answer their calls, and respond promptly if a message is left. With in a week they came and installed my unit. They were clean , efficient and so polite and a pleasure to have in my home . If you’re looking for any mechanical services, these are your guys.

Paul and his team did a great job installing a new HVAC system. They were professional, thorough, and timely. It was really good to work with a small, accessible company rather than a big business. I would highly recommend them!

As a contractor, we have been using Karalis Mechanical for awhile now and we can’t say enough great things about them from all aspects. Great response time, coordinated, clean, professional, great quality with great pricing, and most of all courteous. We will be continuing to use them for the long
foreseeable future!

With many family-owned/small business owners under pressure from big-box retailers, it speaks volumes that Karalis Mechanical Services has been able to create that secret sauce which offers value in terms of competitive pricing and prompt customer service. As of Feb 2025, one can see how price was the top subject theme for their Google reviews and the positive feedback is apparent. Finally, Rachel Pergolese provided prompt email responses from the initial outreach through post-installation support.

The crew at Karalis Mechanical Services is professional, responsive and affordable. I've worked with them multiple times on system installs and service, and have always been satisfied with the results. They are my first and last call for everything HVAC in Delaware, Chester and Montgomery Counties.