

Rapid, around the clock repair service to restore heating or cooling when your system fails unexpectedly.
Scheduled maintenance that improves efficiency, extends equipment life, and prevents costly breakdowns.
Fast, accurate diagnostics and repairs for all HVAC system types to restore comfort and performance.
Professional installation of new HVAC systems designed for long term comfort, efficiency, and reliability.
Full system replacement services that upgrade your home with modern, energy efficient heating and cooling.
Expert service for forced hot water and steam heating systems to ensure steady, dependable heat throughout your home.


























New England winters demand a heating system you can rely on. Dalelis Mechanical provides professional heating installation, repairs, and seasonal maintenance to keep your home warm when it matters most. Our licensed technicians service all major systems, from furnaces and boilers to heat pumps.
With decades of combined experience, we bring precision, safety, and peace of mind to every job. When you need trusted heating experts in Norwood, count on Dalelis Mechanical.

Stay cool and comfortable with Dalelis Mechanical’s professional air conditioning repair, installation, and maintenance services. Our experienced technicians ensure optimal performance and airflow so your home maintains consistent comfort during the hottest months. We specialize in diagnosing issues quickly and delivering long-term solutions.
For dependable air conditioning services in Norwood, MA and nearby towns, trust Dalelis Mechanical to keep your cool air flowing all summer long.

Foxborough has a mix of housing that keeps our HVAC team busy. Near the town center, you will find charming capes and colonials on tree-lined streets, many built in the mid-20th century with original furnaces or boilers that are well past their expected lifespan. Farther out, neighborhoods near Lake Mirimichi and the Chestnut Green community feature newer single-family homes with central air systems that need regular maintenance to stay efficient. Dalelis serves all of it, from a simple thermostat swap in a downtown ranch to a complete heating and cooling system replacement in one of the newer developments along Chestnut Street.
Foxborough is about 11 miles south of our Norwood headquarters, making us one of the closest full-service HVAC companies to town. We handle furnace and boiler repairs, air conditioning installation, heat pump service, ductwork, and more. Game days at Gillette Stadium bring a lot of attention to Foxborough, but the rest of the year it is a quiet, family-oriented community where homeowners care about keeping their homes comfortable and their utility bills reasonable. That is exactly the kind of customer we like working with.
If your heating system struggled to keep up last winter or your AC ran constantly through the summer without cooling your home properly, those are signs that something needs attention. Our technicians will do a thorough inspection, give you an honest assessment, and lay out your repair or replacement options clearly. We also offer seasonal maintenance plans that help prevent breakdowns and extend the life of your equipment, which saves you money over the long run.

When your HVAC system starts making strange knocking, grinding, or loud gurgling noises, it is a clear sign that a component is failing and getting ready to break down. While the unit may still be operational, you should turn it off immediately to prevent further damage. When you hear abnormal noises, reach out to James A. Dalelis Plumbing & HVAC as soon as possible for urgent diagnostics.
If your HVAC system is blowing cold air in the winter while the heater is on, or hot air in the summer when the AC is on, it's time to reach out for emergency HVAC repair. When your system is pushing out air that matches the temperature outside, you're likely dealing with blocked airflow or a broken compressor. Contact James A. Dalelis Plumbing & HVAC and our team will inspect and repair your system right away.

If cool or warm air is only trickling from your vents instead of blowing with full force, it signals that the system is struggling and requires emergency HVAC repair. Weak airflow is typically a sign of components that are malfunctioning or completely worn out. Issues like clogged air filters, dirty coils, failing blowers, or obstructions in the ductwork could cause this problem. If your HVAC system is giving out weak air flow, contact James A. Dalelis Plumbing & HVAC right away.
It's normal for HVAC systems to run more frequently during extreme temperatures, but the time between cycles should stay roughly consistent. If your HVAC system is turning on or off more often than usual, you're likely dealing with a serious issue that needs emergency repair or even replacement. Contact James A. Dalelis Plumbing & HVAC for emergency HVAC services.
If your home is becoming increasingly hot during a summer heatwave, or if your furnace fails to provide heat during a Massachusetts cold snap, you are likely facing an HVAC emergency. In these moments, it is important to take two simple, immediate steps:
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Fast, efficient, and professional. I went to turn my heat on and realized my boiler wasn’t working. It was a Friday before a long holiday weekend but James had one of his guys there first thing Monday morning and my heat was back up and running in just a few hours! Thank you so much!! Highly recommend
Met with me on short notice and took the time to talk about all options, but brief and to the point.
Helped me make a better decision.
Went above and beyond so the work got done in a timely manor and we're very satisfied with the results.
Thank you, James & Crew.
Excellent service. Responded quickly to confirm my appointment and the work was completed quickly the same day. We will be using this company for our yearly heating maintenance.
I had a great experience working with James and his team to install our new boiler and water heater. He worked to understand our needs, gave us solid advice, and provided a competitive bid with no extras or upsells (and no BS!). His work was very professionally done, and it was obvious that he took great pride in his work and in providing the most useful components. He also took the time to explain the work, how the equipment worked, and made sure the settings were what we we were looking for. All in all a great experience, and we will be working with him again.
Walpole, Sharon, Wrentham, Norfolk
11 miles south
A typical central air installation in a Foxborough home takes one to two days depending on whether your house already has ductwork. Homes near the town center that were built without AC often need ductwork added, which can extend the project slightly. We always walk you through the timeline and process before we start.
If your furnace is 15 to 20 years old and the repair costs more than a third of what a new unit would cost, replacement usually makes more financial sense. Newer furnaces are significantly more efficient, which means lower monthly heating bills. We can inspect your current system and give you an honest recommendation based on its condition and age.
Yes. Our maintenance plans include a fall heating inspection and a spring cooling inspection, plus priority scheduling and a discount on any repairs needed during the year. Regular maintenance is the best way to avoid unexpected breakdowns, especially during the coldest and hottest parts of the year in Foxborough.
Foxborough homeowners can take advantage of Mass Save rebates on qualifying heat pumps, high-efficiency furnaces, smart thermostats, and insulation improvements. The rebate amounts change periodically, but they can cover a meaningful portion of the cost of an upgrade. We stay up to date on current incentives and can help you maximize your savings.