I have used MJA for both AC and flooring. I couldn't be happier! They continuously exceed expectations and I trust them completely with my home. read more

Michael and his HVAC staff did a tremendous job in explaining and laying out all that was involved in replacing our HVAC system (Heat Pump and Air Handler). The system they installed is SUPER quiet (I had to go downstairs to see if the air handler was working because we couldn't hear the familiar whoosh of air coming out of our vents (LoL)! I would recommend Michael and his staff for any HVAC system replacement. You will not be disappointed!!! read more

This is a review for MJA Design for a new and vastly improved Heat Inverter system, copper piping, duct work, and thermostat installation within a townhome. Michael Collins was able to allay fears and suspicions concerning previous contractors' price quotations for the work that needed to be accomplished. Mike was courteous, passionate and prompt in his correspondence and manner during the estimate meeting, and then a week later for the installation. The previous unit was under-powered and used the older coolant (with a significant leak), so a new internal and external unit was necessary. For the estimate meeting, Mike came by with a physical notebook containing up-to-date information for pricing of the "common" units that are going to be sold by the competition, along with what should be "proper" pricing (this same information was discovered with a bit of searching the web for this area). One rather important "pricing item" that was explained has to deal with financing and making sure that when discussing pricing for the estimate that the "financing fees of 8% to 14%" are not included unless necessary; this was in discussing the previous estimates I was given from other companies in the area, wherein the costs were inflated relative to the online searches I ran previously. Of note, the piping, circuit, and electrical cabling replacement estimates from MJA Design were far more reasonable than the previous three other HVAC contractor companies. For MJA Design, there is a 3% charge if credit card(s) are used for payment. Mike listened to my requirements for a replacement system and gave me three different options for systems (one of the options was for a similar smaller Heat Pump system as his competition and the other two were for significantly improved systems). In my case, I went with an Amana (modular) Heat Inverter system and will go through MJA to install the other modules over time. This was a major upgrade in the quality of the equipment that would be installed the following Friday (six days later). In other words, using the dollar amounts of the previous three HVAC companies, I was able to get a significantly more efficient system that was .5 tons larger than the system quoted by the other three (all of which were highly rated on Angie's List and Yelp) and a bit more local for my location. Suggestion: If you live in a place with limited parking, do your best to make sure that they have 2 parking spaces that are close to the installation site. This will greatly assist the installers. In my case, Mike and his co-worker, Favian (sp?) arrived on-time (0900), workload/duties split, and talked between themselves when issues arose with the external unit. They were efficient, very passionate, quite approachable. To their mutual credit, they had read their customer correctly, and gave explanations that were easily understood and retained. (To my credit, I managed to stay out of their respective way.) My previous York units were installed on the cheap, with 1/4" copper piping, and multiple internal feeds and a lack of drainage pans. The old York external unit was mounted directly to a concrete block, and had free cabling and piping. The new piping and electrical cabling was very tidy, mounting blocks and rizers were used for the new external unit, cabling and copper pipes were run extremely neatly. The internal unit has more redundancies and has been reduced down to a single feed rather than the previous two. Drainage piping no longer obstructs the new filter. To say that the new units are cleaner and reduced the internal footprint (the external unit is significantly larger than the previous one) is an understatement. Unfortunately for them, the install was not a typical, and they ran into troubles with the original external unit (where it would not recognize the thermostat and internal unit). I was honestly expecting them (this is due to previous experiences of friends and family) to have them come back the following day. This was not the case, they came back after a break for dinner, removing and replacing the faulty Amana external unit and getting everything up and running by 2330 with a replacement. This was to make sure that I would be able to sleep in a less muggy environment than what I had been experiencing during the week with my old HVAC system being down. Both Favian (sp?) and Mike made sure that all was well before leaving for the night, providing advice on the new system (no schedules!) and switching from auto fan to circulate. The following morning, I was quite comfortable with my townhome being more even in temperature 68.7F @ 40% humidity in the basement, 69.3F @ 40% humidity in the middle levels, and 70.2F @ 40% humidity. Mike sent a few text messages to make sure that everything was working well with the new units, I was comfortable, and happy with the new HVAC system, and thermostat. read more

If you want the best heating and cooling system, and premium quality service, this is the company to call. Mike and Favian are the best in the business, and care about the job being done right. I'm happy to be completely honest and admit I work for the competition, as a HVAC technician and engineer who designs installations and sells systems, and have worked for several others. So yes, I could have gotten a new system through the company I work for considerably cheaper, but the quality would have been sub par to even the lowest grade system Mike at MJA installs. And, to add the icing on the cake, with our new system from Mike, we now have airflow conditioning rooms that never received airflow before, and the mini-split system, that conditioned our addition, is unnecessary and obsolete. We also have significantly reduced energy bills, because of choosing a high efficiency dual fuel inverter system, which are known for high reliability, extremely efficient and comfortable conditioning, and only using the minimum energy and fossil fuels required to perfectly condition your home, and has a dehumidification feature that you may adjust for your comfort level. This thing isn't just a piece of mechanical equipment, it's a work of art and true enhancement for the home. When it comes to HVAC, these guys are absolutely the best. read more

Can't say enough good things about their HVAC guys. We didn't pick them as the service was done thru our home warantee. The entire process they were proactive and called us before I even had a chance to call. Their service guys are fantastic, super nice and clean cut, put booties on and covered the work area with a tarp. Very professional and always with an honest opinion and a smile. Thanks to the HVAC team we are sitting cool again! read more

This review is for the HVAC services provided by Mike an his crew. In the past I've always had decent HVAC services provided by local companies, but at some point they inevitably try to upsell me on something I don't need because they assume I don't know better. I am *so thankful* for Mike and his 1) knowledge 2) expertise, and possibly the most important, 3) excellent customer service and honesty. Customer service seems to be a lost art, but not here. Mike, and his crew, are exceptionally professional and friendly attitude. Their work was fast, efficient, and done correctly the first time. The quality of that, combined with their pricing made it a no-brainer to switch over to them for all our HVAC needs in the future. Highly recommended - if you're looking for quality products with the best customer service you could ask for, look no further. (For reference - our 20+ year HVAC system died and we had to have our whole system in our townhouse replaced over the summer.) read more

These guys did a bang up job on my new house. They did sevaral jobs around my house. They were quiet, efficient, respectful of me and my home and the pricing was competitive. Everything you would want with a contractor. Will hire again and have recommended them to my friends. Thanks so much guys! read more

I had a terrific experience with Mike regarding servicing my A/C Unit. Several things stood out to me regarding the overall experience. First, Mike was able to both schedule service promptly and arrive for my appointment in a timely manner, which during a 98 degree+ heat wave in the area was greatly valued. Second, he was very thorough in his diagnosis on my unit. He explained everything to me in a concise and understandable way that left me with an impression that he was very knowledgable and proficient in his work. Third, he gave me several options with pros and cons for each solution and never pressured me into committing really expensive work for the sake of a sale. Lastly, he was professional and courteous in all respects. I highly recommend his company read more

These guys are great. They installed a new HVAC system in my unit within a day. This was a complicated project that required a lot of labor. I'd highly recommend them. read more

We had a really great experience with MJA Design, highly recommended. The compressor in our 15 year old heat pump died, and Mike came by very promptly to assess and give some options. It was clear within a few minutes that Mike is *very* passionate about what he does, he was showing me screenshots of his HVAC system at home and (as a fellow Electrical Engineer) went into the weeds on some of the finer details and specifications for the options in my home. Everything was very low pressure, and of all the companies that came by to give estimates, Mike was the only one who was both doing the estimate AND the install, which gave us some confidence that he wasn't just trying to make a quick sale and move onto the next. To add to this, Mike replied immediately to any inquiries we had (even at 10PM on a Friday evening) which demonstrated some great customer service. On the install day Mike and his coworker Favian arrived exactly on time, gave a thorough rundown of the game plan for the day, and executed. Within a few hours we had heat back in our home and they hauled away all the old equipment leaving no mess behind. One week later and we've had no qualms or issues. Thanks again guys! read more

We have used Whitney for many of our home projects over the past several years. He and his crew are always on time and easy to work with. The work is very high quality and the costs are very reasonable. The products they use are really great quality. We've had carpet and hardwood installed and I wouldn't use anyone else!! Thanks Whitney and MJA!!! read more

As Mike explained to me, the capacitor on my AC's outdoor unit was kaput, leaving me & the dogs in an 80° house. We lucked out, as he was able to come out same-day. Ideally, I like for repairs to be explained, from what's causing the problem, to the solution, & cost. That's exactly what you'll get from these guys-- no surprises, fair & honest work. read more

Great experience working with the team. New HVAC installed with minimal hassle on my part. The team was polite, detail oriented, clean and punctual. Will definitely work with them again! read more

Mike Collins and his team have been great when we contacted them about replacing our HVAC systems. They are very knowledgeable and quick to provide us answers whenever we have questions. They also provided us options for new systems in the high end, middle, and lower ranges. While they would provide us recommendations depending on their analysis of the systems, they leave the decisions up to us and never pressured us to take their recommendations. They worked with us, saved us money, and we are very happy with their service, professionalism, and cleanliness. read more

Hopefully if you see this you read it completely with that being said let me begin. I live in Mineral Va. where everyone is on Lake time,(not in a hurry to do anything) I reached our to several HVAC local businesses to install a new system. After a month of talking to salesmen/installers I knew less about efficiency then before I started. My son asked me to call a company in Manassas Va. because a friend from work had a system installed and loved it so what the heck can't be any worse then what I have been through so far so I gave it a try. I called Mike Collins from MJA Design spoke for several minutes Mike set up an appointment for the next day and drove to the lake about 80 miles! His first question to me was what are your needs and recommended a system based on my needs. Mike explained to me so I would understand how the new systems work from a efficiency prospective. He and Favian came and installed a new Hybrid system heat pump with gas backup furnace. After a month not one company locally called me back which turned out to be a good thing. The install went well completed in one day and looked very clean from an install perspective. Mike reached out to me, later in the week to see how everything was and here is my exact response: "No something is wrong! the temperature stays at 74 degrees and I am not sure how because I can't hear the system running" The outside unit is right by my master bedroom window and for years it sounded like a jet taking off when it came on. I went out several times to see if it was really on could not believe this was so quiet. I could go on forever about MJA Design they are GREAT!!! One more thing I like to help with things, well that didn't go over well because Favian fired me twice in one day and I am the home owner whats up with that? Thanks Mike and Favain for your fantastic job and taking the time to go over everything about the install and operation on the new system. I am so glad my son gave me your number. Thanks Ryan a yet another MJA Design happy customer read more

I was about to get the 11th band-aid repair to my original builders grade furnace. I gave Mike & Mauricio a call to get it fixed up before the heating season. They inspected the furnace and were able to show me that it had a full on carbon monoxide leak. 24 hours later, with very reasonable cost and zero hassle, I had a brand new furnace fully installed. They even made plumbing modifications to suit the new furnace installation at no additional cost. I couldn't have been happier with the experience. read more

In all the homes I've remodeled, I've never met anyone who knows HVAC and heating like Mike and MJA Design. They redid an older home for me in Alexandria. Excellent work at a reasonable price! I recommend them 100%, they are timely, ethical, professional, knowledgeable and communicate throughout the process. Mike knows A/C COLD ( no pun intended)! read more