SumZero Energy is an owner-operated company. We are Home ENERGY Improvement Contractors. The services we offer are: - Heating - Cooling - Ventilation - Energy Assessments Our goal is to improve home comfort and efficiency through building science principles. We pride ourselves in solving root issues of energy problems, customer service, and quality work.
Business highlights
6 years of trusted experience
Services we offer
Replacement and new installation of heating, cooling, ventilation, and Mini-Splits
SumZero has been great to work with on this rather complex project. From Paul's communication to Marcelo's great installation leadership, and Daniel's final adjustments this was executed with precision, great communication and quality. I looked at several options, probably had 3-4 other quotes, various vendors, Paul was the only one who understood that I needed an extra zone split and embedded that into the proposal. His team further revised the details during the install to optimize air flow. When COVID-driven supply chain difficulties got in the way, Paul kept us informed and was able to exceed his commitments. Sarai also guided us to a 0% 84-month loan in a couple of days, and promptly refunded deposit money not covered by it. We are excited to have our new Bosch Heat Pump and looking forward to many years of fine operation!
Description of Work: Replace 30+ year old AC with modern HeatPump
Rating Category
Rating out of 5
quality
5.0
value
4.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$17,000
Jonice W.
03/2021
5.0
heating & air conditioning/hvac
 + -1 more
Illija and his crew were great. They were vastly less expensive than three other quotes, yet did top quality work. They were very professional and respectful of COVID constraints, and arrived exactly when they said they would (which was a great sign for how they were going to handle the install). I rarely post reviews, but when a small company does such outstanding work for such a great price, I feel compelled to let others know.
Description of Work: Install mini-split AC system in small house
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$8,400
Response from SumZero Energy Systems
Thank you so much for your kind words. It means a lot to us!
Karen C.
02/2021
5.0
heating & air conditioning/hvac, insulation, energy audit
 + 1 more
David and Wandersen have an amazing team! I have never worked with a more professional, knowledgeable and courteous team before. Every single person that works with Sum Zero was impressive. They were willing to answer all of our questions, provide accurate quotes and were always open to additions as the jobs moved forward. I welcomed them in my home for a week and a half of work and would do so again in a heartbeat. You cannot go wrong with hiring Sum Zero!
Description of Work: Complete heat pump HVAC installed, removal of old system and spray foam insulation of the house
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
Response from SumZero Energy Systems
Thank you for such kind words! It was a pleasure working with you!
Louis C.
01/2021
5.0
heating & air conditioning/hvac
 + -1 more
Great experience with this company. Interviewed three other companies. I worked with David at SumZero --and decided to go with them because he took the time to understand what I needed. Their pricing is very competitive and transparent. So you don't have to guess as to what is not included-- something that can't be said of some of the other companies I interviewed. I also liked that David made it easy for me to understand the technical jargon which ultimately gave me confidence that the final system configuration was best suited for our needs. He was very flexible throughout the entire process from start to finish. David also ensured the system qualified for the MassSave 0% energy loan and maximized the available rebates--which he is helping me to secure. The crew they sent out to install the system was very pleasant, respectful of our home, and very hard working. When the system was tested and ready to go online, SumZero had a technician onsite to show us how to operate the system. We love the Mitsubishi mini split system--it is amazing. Great experience from start to finish with SumZero. Totally recommend them without reservation.
Description of Work: Installation of mini split heat pump and cooling system for the entire house.
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
Response from SumZero Energy Systems
Thank you for allowing us to serve you! It was a pleasure working with you!
David H.
10/2020
5.0
heating & air conditioning/hvac, water heater repair, energy audit
 + 1 more
Amazing experience to work with Ilija and his team. They were much less than two other quotes and in my opinion were worth double what we paid as they made sure everything was perfect. I can be a real picky person. But in the case I had to write a review and say amazing job done!!
Description of Work: Duct work, 2 systems for heat and AC
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$23,000
Kevin M.
07/2020
5.0
heating & air conditioning/hvac
 + -1 more
very timely, efficient, and professional
Description of Work: Central Ac Repair
Rating Category
Rating out of 5
Yes, I recommend this pro
Trevor W.
06/2020
4.0
insulation
 + -1 more
Ilija showed up on time to quote me on this job. He was professional, and seemed to know the product, and trade well. He also provided a quote in the timeframe he had committed to. I ended up not going with SumZero as they were considerably more expensive than the other quotes I received. I do not believe they are a "rip off", but they might be a good option for folks with deeper pockets.
Description of Work: Closed cell foam insulation for attic, and basement rimjoists
Rating Category
Rating out of 5
value
2.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Response from SumZero Energy Systems
Although we were not able to serve you we thank you for your kind review!
Michael M.
05/2020
5.0
heating & air conditioning/hvac
 + -1 more
These guys were fantastic. Given the Covid 19 pandemic they did all the prep work with me on video chat. I was given a number of options and recommendations. I got several quotes and they had the best price. Everything was installed with care, on time, and at the quoted price. I would gladly work with them again.
Description of Work: Mini Split Installation
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
$11,000
Response from SumZero Energy Systems
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Bruno A.
05/2020
5.0
heating & air conditioning/hvac
 + -1 more
Very professional and honest! The sum zero team did an excellent installation on new heating system. Highly recommend them!
Description of Work: Hvac/ heating system
Rating Category
Rating out of 5
quality
5.0
value
5.0
professionalism
5.0
responsiveness
5.0
punctuality
5.0
Yes, I recommend this pro
Response from SumZero Energy Systems
Thank you for kind words!
Louisa T.
11/2019
5.0
heating & air conditioning/hvac
 + -1 more
Excellent!! really impress with the owner. Gave though about our project. Very smooth working with him. Had a can do attitude and finish in a timely way.
Description of Work: Install HVAC system
Rating Category
Rating out of 5
Yes, I recommend this pro
Response from SumZero Energy Systems
It was a pleasure, thank you!!
marlene A.
11/2019
5.0
heating & air conditioning/hvac
 + -1 more
It was great. He took care of everything and answer all question. Help with different options. The work was exactly what the quote came too.
Description of Work: They put mini split units, heat pump and central A/C
Rating Category
Rating out of 5
Yes, I recommend this pro
Response from SumZero Energy Systems
Thank you for your kind review! It was a pleasure working with you!
Steve G.
11/2019
5.0
water heater repair
 + -1 more
It was fantastic, professional, friendly, they put attention to detail.
Description of Work: They replaced my hot water heater and boiler.
Rating Category
Rating out of 5
Yes, I recommend this pro
Response from SumZero Energy Systems
Thank you very much [Member Name Removed]. It was a pleasure serving you!
John G.
11/2019
5.0
heating & air conditioning/hvac, insulation
 + 0 more
They're most professional, they're great at what they did, attentive, easy to work with and very competitive price.
Description of Work: They did full new heating system and they also did the foam insulation.
Rating Category
Rating out of 5
Yes, I recommend this pro
Response from SumZero Energy Systems
Thank you very much for your kind review. It’s a pleasure working with you !
All statements concerning insurance, licenses, and bonds are informational only, and are self-reported. Since insurance, licenses and bonds can expire and can be cancelled, homeowners should always check such information for themselves. To find more licensing information for your state, visit our State Contractor License Requirements page.
*Contact business to see additional licenses.
Service Categories
Heating and Air Conditioning
FAQ
SumZero Energy Systems is currently rated 5 overall out of 5.
Sunday: Closed
Monday: 8:00 AM - 5:00 PM
Tuesday: 8:00 AM - 5:00 PM
Wednesday: 8:00 AM - 5:00 PM
Thursday: 8:00 AM - 5:00 PM
Friday: 8:00 AM - 5:00 PM
Saturday: Closed
SumZero Energy Systems accepts the following forms of payment: Check,CreditCard,Financing Available
Yes, SumZero Energy Systems offers free project estimates.
No, SumZero Energy Systems does not offer eco-friendly accreditations.
No, SumZero Energy Systems does not offer a senior discount.
No, SumZero Energy Systems does not offer emergency services.
Yes, SumZero Energy Systems offers warranties.
SumZero Energy Systems offers the following services: Replacement and new installation of heating, cooling, ventilation, and Mini-Splits