

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.

Newton is not your typical suburb. It is really a small city made up of 13 distinct villages, each with its own downtown, its own housing stock, and its own personality. In Chestnut Hill, you'll find grand estates from the early 1900s with original radiator systems that need careful attention. Over in Newton Highlands, the Victorian and Edwardian homes along Lincoln Street often have boilers that are long past their useful life. West Newton Hill has stately colonials where homeowners frequently ask us about adding central air without disturbing plaster walls and original woodwork.
The postwar neighborhoods tell a different story. Oak Hill was built specifically for veterans in the late 1940s, and many of those original heating systems have been replaced once or twice already. In Auburndale, the larger-lot homes near the Charles River can deal with basement moisture that affects furnace performance and indoor air quality. Nonantum's tightly packed homes along Adams Street present their own set of challenges when it comes to equipment placement and airflow.
Dalelis is about 10 miles south of Newton, and we make the drive regularly. Whether you need a boiler replacement in Newton Upper Falls, a ductless system in a Newton Corner condo, or a full AC install for a growing family in Waban, we bring the same careful, honest work to every job. Newton homeowners appreciate that we take the time to understand their home before recommending a solution.

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:
.png)

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.
Needham, Dedham, Natick, Westwood
10 miles north
Many Victorian homes in Newton Centre and Newton Highlands lack the space for traditional ductwork. Ductless mini-splits are often the best fit because they provide both heating and cooling without requiring invasive construction. For homes with existing radiator systems, we can also upgrade the boiler to a high-efficiency model while keeping the radiators in place.
Multi-story homes across Newton commonly have upper floors that are too hot in summer and too cold in winter. Zone control systems allow you to set different temperatures for different areas of the home. We can retrofit zoning into many existing systems or recommend supplemental ductless units for problem areas.
Yes, we serve every village in Newton, from Nonantum to Chestnut Hill and everywhere in between. Our technicians are familiar with the different housing types across the city and regularly work in all 13 villages. We carry the parts and equipment needed for both older and newer systems.
Boiler replacement costs in Newton typically range from $5,000 to $12,000 depending on the type of unit, the complexity of the installation, and whether any piping or venting modifications are needed. Many of Newton's older homes have unique configurations that affect pricing. We provide a free in-home estimate with a detailed breakdown before any work begins.