Serving North Chelmsford, MA and surrounding areas
Approved
In business since 2017
Free estimates
Emergency services offered
"Fantastic team 2 Heat pump installations Optimized for rebates Love it"
+40
Serving North Chelmsford, MA and surrounding areas
Approved
In business since 2015
Free estimates
Offers commercial services
"DGWELLS installed heating and air conditioning in our new home 2 years ago. Did a great job. Courteous and neat. No problems whatsoever with our system. Called with questions that he readily answered and came by to show us how to change the filter last year. Cannot say enough good things about David Wells. Highly recommend him."
Serving North Chelmsford, MA and surrounding areas
Approved (Corporate)
In business since 1967
Free estimates
Emergency services offered
"Our daughter and her husband are living out of the country, temporarily. When their leasees said the furnace was blowing cold air, we wanted the repair done quickly and at a good price. Unique Indoor Comfort Heating & Cooling responded right away and came to the property the same day we called. Very professional!"
+6
Serving North Chelmsford, MA and surrounding areas
Approved
Free estimates
Emergency services offered
Warranties offered
"Absolutely top notch service and knowledge for the best price around Literally wouldn’t even consider calling another hvac company - thank you Keenan we look forward to the next time we need your services"
+56
Serving North Chelmsford, MA and surrounding areas
Approved
In business since 2020
Free estimates
Credit card accepted
"I would highly recommend Dodge Cooling and Heating. They did a Spring tune up on my central air conditioning system and were extremely responsive, prompt, professional and knowledgeable. I will definitely use them for any future heating and A/C needs that I may have."
+4
Serving North Chelmsford, MA and surrounding areas
Approved
In business since 2011
Free estimates
Emergency services offered
"I recently had a brand new HVAC system installed for both heating and cooling, and I couldn’t be happier with the experience. The team at Comfort Professor was extremely professional from start to finish. They worked efficiently, paid attention to every detail, and left everything spotless when the job was done. The cleanup was perfect, which I really appreciated. Highly recommend them if you’re looking for quality work and a smooth, hassle-free installation!"
Serving North Chelmsford, MA and surrounding areas
Approved
In business since 1990
Free estimates
Emergency services offered
"I’ve been a satisfied customer of Druziakos HVAC for 17 years, so when I found out I needed my gas furnace and central air replaced I didn’t look to anyone else. Everyone in the office was very helpful with the Mass Save program and process. They also submitted my rebate applications and helped with the warranty info. The work was done when scheduled and very quickly. The technicians were polite and answered all my questions."
+3
Serving North Chelmsford, MA and surrounding areas
Approved
In business since 1981
Free estimates
Emergency services offered
"He explained how they would design and install the new furnace and all the zones. He obtained new hot water heater at no additional cost as well as the available rebates. The actual installation was accomplished in one and a half days. Everything was done very professionally and the area left totally clean. He"
+64
Serving North Chelmsford, MA and surrounding areas
Approved
In business since 1995
Free estimates
Emergency services offered
"I own an older cape that was built in 1959. My wife and I have been living with window air conditioners for the past 13 years, as the our house has no ductwork to accommodate conventional central air conditioning. We did some research on high velocity, micro-duct A/C systems as an alternative to conventional central air systems. We heard about Joyce Cooling & Heating from our next door neighbor, whose father had used them several years ago and we decided to give them a call. The salesman, Abe, came out the next day to determine project scope and provide a quote (scope can be quite complicated depending on layout of house). Abe went a step further and brought the owner, Tony, out to the house a few days later and together they explained the project in detail and provided us with ideas/options on how to configure the system. The project began on June 13 and was completed on June 16. The installation team (mechanic - Bob and apprentice - Mitch) was polite, courteous and most efficient. The amount of work that they accomplished in 3 days far exceeded my expectations. They left my house immaculate at the end of each workday. High velocity A/C systems are not cheap, however, my wife and I could not be happier with our investment in this quality product. The entire Joyce team is clearly focused on customer satisfaction and they made this an enjoyable experience for us. I would definitely recommend Joyce Cooling & Heating to others."
+2
Serving North Chelmsford, MA and surrounding areas
Approved
In business since 2010
Credit card accepted
Customers say: Quick response
"I hired Marcin & his team at Precision Plumbing & HVAC for multiple projects. First to handle all plumbing in a gutted bathroom renovation, then to replace an old gas water heater and furnace with a new high efficiency combi boiler. I've since recommended them to friends and family and would absolutely do so again."
A standard blower door test takes between 30 minutes and one hour to complete. The process involves setting up specialized equipment in your doorway, running the fan to create pressure differences, and taking measurements throughout your home. Additional services like thermal imaging or detailed leak detection will extend this timeframe. The technician will also spend time explaining the results and making recommendations based on their findings.
Preparation involves turning off all combustion appliances, such as gas furnaces and water heaters, for safety. Secure all exterior doors and windows, but leave interior doors open to allow airflow throughout the house. Close fireplace dampers and cover any ashes to prevent them from being drawn into living spaces. Clear access to potential inspection areas like attics and crawlspaces, and inform everyone in the household about the test to prevent accidental door openings during the process.
Older homes often benefit most from blower door testing because they have more air leakage points than newer construction. The test can pinpoint specific areas where relatively inexpensive improvements will yield significant energy savings.
Many homeowners of vintage properties report noticeable reductions in drafts and more consistent indoor temperatures after addressing issues identified during testing. The potential utility savings often recover the testing cost within a reasonable timeframe.
New construction must meet increasingly stringent energy codes that specify maximum allowable air leakage rates. Meeting these standards requires careful attention to air sealing details during construction.
Success depends largely on properly installing air barriers, thoroughly sealing around penetrations, and quality control throughout the building process. While achieving code compliance is challenging, builders who implement systematic air sealing protocols succeed in meeting required standards.
It's best to schedule a follow-up test after completing all recommended air sealing and insulation work. This allows you to verify the effectiveness of your improvements as a complete package. Allow sufficient time for all sealing materials to cure properly—often a few weeks after completion. The verification test provides documentation of your home's improved performance and confirms you've addressed the issues identified in the initial assessment.
From average costs to expert advice, get all the answers you need to get your job done.
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