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Avatar for SumZero Energy Systems, LLC
SumZero Energy Systems, LLC
4.4(
23
)
Central A/C - InstallDuctless Mini-split A/C - Install or Replace

Serving Millis, MA and surrounding areas

Approved

In business since 2009

Free estimates

Credit card accepted

"SumZero Energy Systems have been excellent in the last several months with supporting the replacement of my air conditioning system in my old condo as well as servicing my furnace. A price comparison with other local companies also prooved SumZero Energy Systems offered the best price. When I purchased a home a few months later, I called them to take a look at my air conditioning system and furnace because I felt as though they had provided such excellent service in the past. It was a no-brainer to ask for consultation regarding the heating and cooling systems in my new home! When I contacted them for assistance or consultation, they are usually quick to respond and provide appointment times had a very convenient window! They have shown up on time to all of the appointments I have had. David S. has always taken the time to explain everything thoroughly and answer all my questions. I highly recommend SumZero Energy Systems!"
Mitsubishi Heat Pump
MITSUbishi Hyper Heat Heat Pump
Wall Unit (GL Model)
'One-Way' Ceiling Cassette
'Floor Mount' Unit

+9

Response time2 days
Response rate88%
16 neighbors recently requested a quote
Avatar for Pro Heating & Cooling
Pro Heating & Cooling
4.9(
25
)
Ductless Mini-split A/C - Install or Replace

Serving Millis, MA and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"We chose Pro Heating & Cooling to do an oil to High Efficiency gas boiler conversion. Sean provided a clear and concise quote for the the full job, including a challenging removal of our oil tank. We needed the job done ASAP and Sean was able to accommodate our request and complete the full job in a day. His crews were prompt, and seamlessly coordinated to convert our combo forced hot water and air system while creating a much tidier and well laid out integration with the new boiler and indirect water heater. After the instillation Sean checked in and came to do minor adjustments to ensure the system was dialed in to run perfectly. Lastly, the pricing was great, and the instillation was designed to maximize the available Mass Save rebates for energy efficient systems. I'd recommend Pro Heating without hesitation (as I did to a friend/neighbor)!"
Oil Boiler Replacement
Single zone DMS
Single zone DMS
Two  Tankless Water Heaters
Response time2 days
5 neighbors recently requested a quote
Recommended by82%of homeowners
Avatar for G&C Plumbing and Heating, LLC
G&C Plumbing and Heating, LLC
5.0(
93
)
Central A/C - Service or Repair

Serving Millis, MA and surrounding areas

Approved (Corporate)

Super Service Award Winner

In business since 2005

Small jobs welcome

Credit card accepted

"In the heat of the summer, our air conditioning shut down. I was worried that I was going to have to spend several thousand dollars to replace it. G & C came out to diagnose the issue and had it solved within an hour. They educated me about Maintainence so that this doesn’t happen again. Very happy with the service and professionalism. I will definitely be using them again!"
Burnham X2 Boiler
Water Heater Upgrade
Water Heater Upgrade
Water Heater Upgrade
Water Heater Upgrade

+16

Response time5 hrs
Response rate100%
10 neighbors recently requested a quote
Avatar for ENDLESS ENERGY NEW ENGLAND, INC.
ENDLESS ENERGY NEW ENGLAND, INC.
4.7(
20
)
Central A/C - InstallDuctless Mini-split A/C - Install or ReplaceCentral A/C - Service or Repair+4 more

Serving Millis, MA and surrounding areas

Approved

In business since 1980

Free estimates

Emergency services offered

Endless Energy is a trusted local HVAC and Plumbing Company servicing the majority of the state of Massachusetts with office in Marlborough, Needham, and Randolph. Specializing in Heat Pumps, Central AC, Furnaces, and Boilers, we have Master Plumbers, Electricians, and HVAC Technicians all under one roof reducing your need to find multiple contractors! We are also a Mass Save partner and can conduct your no cost Mass Save Home Energy Assessment and install any recommended insulation.\n\nWe can help you with: \n*Heating Repairs, Installation, & Service\n*AC Repairs, Installation, & Service\n*Plumbing Repairs, Installation & Service\n*Water Heater Replacement & Service\n*Indoor Air Quality Solutions\n*Ductwork & Line Set Solutions\n*Electrical Panel Upgrades and Replacement\n*Insulation \n*No Cost Home Energy Assessments\n\nA Mass Save certified contractor with an A+BBB rating. All of our skilled technicians undergo an extensive background and drug screening prior to being hired to our team!

Holliston Heat Pump
Boston Heat Pump
Natick Ducted System
240 neighbors recently requested a quote
Recommended by70%of homeowners
Avatar for Turkey Heating and Cooling, Inc.
Turkey Heating and Cooling, Inc.
4.9(
22
)
Central A/C - Service or Repair

Serving Millis, MA and surrounding areas

Approved

In business since 2015

Warranties offered

Small jobs welcome

"Professional HVAC is honest , very professional as well. Ronald showed up on time and he was able to discover the issue with my mini spilt and found the where is the leak. I highly recommended them."
HVAC
Response time9 hrs
25 neighbors recently requested a quote
Recommended by62%of homeowners
Avatar for BK Appliances
BK Appliances
4.4(
811
)
Central A/C - Service or Repair

Serving Millis, MA and surrounding areas

Approved

Super Service Award Winner

In business since 2001

Emergency services offered

Customers say: Quick response

"MY AC Died July 3rd and it was HOT I called BK and everyone else the morning of the 5th, Bernard was ale to come out that day at about 11am. Bernard was so professional and nice and knowledgeable he really made me feel comfortable and understand what had gone wrong with my AC and why. From now on I will call BK Appliance. I highly recommend them."
Response time5 hrs
Response rate100%
Recommended by94%of homeowners
Avatar for Rodenhiser Home Services
Rodenhiser Home Services
4.4(
522
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral A/C - Service or Repair+12 more

Serving Millis, MA and surrounding areas

Approved

In business since 1928

Emergency services offered

Warranties offered

"From start to finish we have had a great experience with Rodenhiser. Rick Picard came out to look at our system and provided a few estimates for different options while on site. We needed most of our 35 year old central air conditioning system replaced. The communication from the company was impressive. We always knew who was coming and when. They helped with the initial MassSave paperwork and even submitted all of the rebate paperwork for us when the install was complete. Good luck finding another company that will do the same. Our installers (Brian Heno and Dylan E.) arrived on time every day. They were professional, kept us updated on their progress and cleaned up daily. Two very hard working guys. They did a great job with the install. It looks and performs fantastic. We could not be happier with the system now that it is installed. We chose the correct company to work with. This is our second time having Rodenhiser complete a major install at our house. We had them install a furnace several years ago. I highly recommend them for your HVAC needs. Thank you."
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40 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for H L Bowman
H L Bowman
4.6(
422
)
Central A/C - InstallCentral A/C - Service or RepairCentral Air Cleaner - Install or Replace+1 more

Serving Millis, MA and surrounding areas

Approved (Corporate)

In business since 1946

Free estimates

Emergency services offered

"H L Bowman is by far one of the best service companies that I have dealt with. I got a call that the technician was on the way to my house. George showed up and got right to work. Found my problem and explained to me the best way to fix my issue. They did not try to sell me on any pricier fixes. George showed me what he could offer and explained what would be my best option. He was knowledgeable, informative, and explained everything so that I would understand what was going on. I am definitely going to be using them for all my heating and air conditioning needs. Top notch company. Would recommend to anyone needing this kind of help."
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+6

712 neighbors recently requested a quote
Recommended by87%of homeowners
Avatar for Accurate Heat-Air Services, Inc
Accurate Heat-Air Services, Inc
4.1(
12
)
Central A/C - InstallCentral A/C - Install - For BusinessCentral Air Cleaner - Install or Replace+2 more

Serving Millis, MA and surrounding areas

Approved

In business since 1989

Free estimates

Emergency services offered

"I typically get several estimates before any major expense. I do this to gather information as well as compare price and the people behind the websites. Two other companies were recommended to me by friends. Accurate was my third estimate. My previous furnace was installed by Accurate and serviced by Accurate so I was going to check with them before buying a new furnace. Accurate even showed up first thing one winter morning when the furnace didn't turn on. 



Each estimate said something a little different about which furnace to buy and how it should be installed. Derek from Accurate showed up on time and appeared to know the product and the installation requirements - including the expectations of the local building inspector. The building inspector has to approve the installation when it is finished. I honestly don't know if I chose the right furnace by purchasing a TRANE. I didn't want the most expensive model and I wasn't pressured to buy it. I did buy the pricey air  filter since a family member has allergies. 



The installation process went very smoothly. The man who spent all day doing the installation was low-key, friendly, and appeared to be doing a careful job. E.g., he didn't talk on his cell or blare a radio. Accurate arranged for the plumber to do the gas line hook up and the electrician to connect the new furnace and install a CO2 alarm. The plumber returned at a later date to show the finished job to the building inspector.



 It took a lot of time to learn about the new high efficiency furnaces, talk to friends about how they managed home heating issues, and then meet with contractors. Since it's such an expensive and long-term purchase, it's a tough decision. I decided to stay with Accurate based on past experience and I think it was the right call.
"
Hydronic Air Handler
Hydronic Air Handler
Condenser Farm
Trane Furnace
Trane Furnace

+2

4 neighbors recently requested a quote
Recommended by70%of homeowners
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FAQs for air conditioning projects in Millis, MA

Most professional HVAC technicians require two to three hours to complete an expansion valve replacement. The timeframe depends on your unit's accessibility and whether additional repairs are needed. The process involves recovering refrigerant, removing the old valve, installing the new component, and recharging the system. Scheduling during less busy seasons may result in more convenient appointment times.

Operating your air conditioner with a malfunctioning expansion valve isn't advisable. Continuing to run the system could potentially damage other components, particularly your compressor, which is significantly more expensive to replace. If you notice performance issues like inconsistent cooling or unusual noises, it's best to have your system inspected before continuing regular use.

Expansion valves don't have a standard replacement schedule, as their longevity depends on system usage, maintenance frequency, and environmental factors. Regular professional maintenance helps identify potential valve issues before they cause system failure. Having your HVAC system serviced annually allows technicians to monitor component condition and recommend preventative replacements when necessary.

Refrigerant leaks require prompt professional attention. If your expansion valve is leaking, you'll likely notice reduced cooling performance and possibly hear hissing sounds near the unit. Addressing leaks quickly prevents further system inefficiency and avoids the environmental impact of released refrigerant. Your HVAC technician will need to repair the leak and recharge the system with the proper refrigerant type and amount.

Because many AC issues present similar symptoms, professional diagnosis is recommended. Problems like inadequate cooling, inconsistent temperatures, or strange noises could indicate expansion valve issues, but might also stem from refrigerant leaks, electrical problems, or airflow restrictions. A qualified HVAC technician has the tools and expertise to accurately identify the root cause and recommend appropriate repairs.

The Millis, MA homeowners’ guide to air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.