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Q: How often do you need to add Freon to an AC?

• <div><p>Good news: Your AC system doesn&rsquo;t need Freon (a popular refrigerant) added regularly, if ever. Freon only needs to be added when there&rsquo;s a refrigerant leak; however, it&rsquo;s not uncommon for a gradual leak to occur every 5 to 15 years. Signs of a refrigerant leak include higher utility bills, increased humidity in the house, weakened AC performance, and a hissing sound from the system.</p></div>

Q: How many watts does an AC use?

• <div><p>An <a href="https://www.angi.com/articles/how-many-watts-ac.htm">air conditioner&rsquo;s watt usage</a> depends on multiple factors, including the type of AC unit, its size, and how often you use it. With that said, most central air conditioners consume between 3,000 and 3,500 watts. Meanwhile, window AC units use 900 to 1,400 watts, and portable air conditioners consume 2,900 to 4,100 watts. </p></div>

Q: What is included in an HVAC service call?

• <div><p>Most HVAC service calls include diagnostic fees, which could include checking on a specific issue you&rsquo;re experiencing or running through a routine inspection checklist. If you called for a particular problem, the service call will also include an estimate to fix the issue, including materials and labor. Depending on your HVAC technician and the service you requested, you might also get a general inspection of your system components to ensure everything is working as intended.</p></div>

Q: How long should my HVAC last?

• <div><p>With the proper maintenance and repairs, your HVAC can last <b>15 to 25 years</b>. However, it depends on the type of equipment you have and the average lifespan of each, including:</p><ul><li><p><a href="https://www.angi.com/articles/oil-furnace-replacement-cost.htm">Oil furnace</a>: <b>10&ndash;15 years</b></p></li><li><p><a href="https://www.angi.com/articles/common-gas-furnace-prices.htm">Gas furnace</a>: <b>20&ndash;30 years</b></p></li><li><p><a href="https://www.angi.com/articles/how-much-does-boiler-installation-cost.htm">Boiler</a>: <b>20&ndash;35 years</b></p></li><li><p><a href="https://www.angi.com/articles/how-much-does-installing-new-ac-cost.htm">AC unit</a>: <b>7&ndash;20 years (location dependent)</b></p></li><li><p><a href="https://www.angi.com/articles/heat-pump-systems-explained.htm">Heat pump</a>: <b>10&ndash;20 years</b></p></li><li><p><a href="https://www.angi.com/articles/how-ductless-mini-split-heat-pump-works.htm">Ductless mini-split</a>: <b>10&ndash;30 years</b></p></li></ul><p></p></div>

Q: Does my HVAC technician have to be NATE certified?

• <div><p>NATE (North American Technician Excellence) certification is not legally required for HVAC technicians in most areas, but hiring a professional with this certification is highly recommended. NATE-certified technicians demonstrated their expertise and proficiency in <a href="https://www.angi.com/articles/common-types-of-HVAC-systems.htm">different types of HVAC systems</a>, offering assurance of quality service. It's a voluntary certification, yet it indicates a commitment to professionalism and ongoing training. Choosing a NATE-certified technician often means you're working with someone who is up-to-date on industry standards and best practices, which can lead to better service, energy efficiency, and long-term cost savings. </p></div>

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Verified Reviews for Heating And Air Conditioning Service pros in Walpole, NH

*The Angi rating for Heating And Air Conditioning Service companies in Walpole, NH is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.

*The HomeAdvisor rating for Heating And Air Conditioning Service companies in Walpole, NH is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Heating And Air Conditioning Service needs.

Last update on January 19, 2026

Reviewed in August 2025
On-time and provided a comprehensive inspection and report. Communicated well throughout the process.
Total Property Inspections
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Reviewed in July 2025
Legendary Painting did a beautiful job painting the exteriors of both our house and pole barn. Their professionalism and communication were outstanding throughout the whole process. The crew was very courteous arriving on time for work each day, and working diligently throughout the day even in...
Legendary Painting
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Reviewed in June 2024
Wonderful and timely communication wmthroughout, hard work and professional crew, reliable and high quality work. Highly recommend!
Finley Construction Company
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Reviewed in March 2024
Jeff installed a Murphy bed I brought to Keene. The job was complex and the pieces were very heavy. Jeff got it done with no hassle and no mess and no fuss and a fair price. It was a great job. Iâ ll be back to Jeff about remodeling two rooms next.
Jeff Love
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Reviewed in February 2024
He was prompt and I was happy with his work.
Kennedy Junk Removal, LLC
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Reviewed in December 2023
I was very pleased with the bathroom reno that Dany and his sons did. I spent 20 years in the kitchen & bath remodeling business and Iâ ve had contractors come and go. This was a good experience and I am already planning to work with them again.
Bathrooms Revitalized
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Reviewed in December 2023
A good, small moving company. They appear to have one truck. They hang in until the end and stay with the job until completion. You may not get all the bells and whistles of large companie, and may need to be very flexible, but they will perform well.
Royalty Moving Systems, LLC
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Reviewed in May 2023
Jeff Thibodeau is a top notch professional and I would highly recommend Minuteman Heating and Cooling! Replaced my mini-split at the beginning of May. He was on time the day of installation (imagine that!) answered all of my questions and provided such service at a cost that was almost half of...
Minuteman Heating Cooling Refrigeration, LLC
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Reviewed in March 2023
Work was well done and effiecient.
Monadnock Electric
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Reviewed in September 2021
Wonderful and professional work all the way. I would recommend Todd Faulkner to anyone. Excellent and very detailed work. Fair cost and great work. Could not ask for anything more!!!!!
Faulkner Driveway Repair and Trees, LLC
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