HVAC Contractor in Dedham, MA

Your System Fixed Right the First Time

When your heating or cooling fails, you need an HVAC contractor who shows up ready to solve the problem—not guess at it.

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Professional HVAC Services Dedham

Comfort You Can Count On

Your HVAC system should work when you need it most. No more sweating through summer nights because your air conditioning decided to quit. No more bundling up indoors when your heating system won’t turn on.

When we finish a job, your system runs efficiently and reliably. You get consistent temperatures throughout your home, lower energy bills, and the confidence that comes from knowing your equipment was serviced by technicians who actually know what they’re doing.

That’s what happens when you work with an HVAC company that focuses on getting it right instead of getting it done fast. Your comfort matters, and your system should reflect that priority.

Best HVAC Company Dedham

We've Built Our Reputation One System at a Time

Dempsey Energy has been serving Norfolk County homeowners who refuse to settle for mediocre HVAC service. We’ve built a customer base of over 12,000 satisfied customers by focusing on what actually matters—showing up when promised, diagnosing problems correctly, and fixing them right the first time.

We don’t just handle emergency repairs. We provide comprehensive heating and cooling services, from routine maintenance that prevents breakdowns to complete system installations that deliver years of reliable performance.

Our Dempsey Comfort Club membership program gives customers priority service and ongoing maintenance, because we understand that preventing problems beats fixing them every time.

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HVAC Contractor Near You

Straightforward Service, No Surprises

When you call, you’ll speak with someone who can actually help you—not a call center that puts you on hold. We’ll ask the right questions to understand what’s happening with your system and schedule a time that works for you.

Our technician arrives with the tools and knowledge needed to diagnose your system properly. No guesswork, no unnecessary upselling, just a clear explanation of what’s wrong and what it takes to fix it. You’ll know exactly what you’re paying for before any work begins.

After the repair or installation, we make sure everything is working correctly and explain what we did. You’ll also get guidance on maintaining your system to prevent future problems. If you need follow-up service, we keep detailed records of your equipment and service history.

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Heating System Not Turning On

Complete HVAC Solutions for Your Home

Whether your HVAC system is blowing hot air when it should be cooling, your heating system won’t turn on, or you’re dealing with inconsistent temperatures throughout your home, Dempsey Energy handles the full spectrum of heating and cooling challenges.

Our services include emergency repairs when your system fails unexpectedly, routine maintenance to keep everything running smoothly, and complete system installations when it’s time to upgrade. We also provide energy efficiency consultations to help you reduce those monthly utility bills that seem to climb higher every year.

Norfolk County’s climate demands reliable HVAC systems. From humid summers that test your air conditioning to cold winters that push your heating system to its limits, your equipment needs to perform consistently. That’s exactly what you get when experienced technicians service your system using the right parts and proven methods.

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Emergency response times depend on the current service demand and your location within Dedham, but we prioritize urgent situations where customers have no heating or cooling. We understand that HVAC emergencies don’t wait for convenient times—systems often fail during the hottest summer days or coldest winter nights when you need them most. Members of our Dempsey Comfort Club receive priority scheduling for both emergency and routine service calls. When you call with an emergency, we’ll give you a realistic timeframe and keep you updated if anything changes.
First, check your thermostat settings and make sure it’s set to heat mode with the temperature set higher than the current room temperature. Verify that your circuit breaker hasn’t tripped and that your furnace power switch is on. Check if your air filter is extremely dirty, as this can cause safety shutoffs. If these basic checks don’t solve the problem, you likely have a more serious issue that requires professional diagnosis. Common causes include faulty thermostats, ignition problems, or safety system malfunctions. Don’t attempt to bypass safety features or force your system to run—this can create dangerous situations and expensive damage.
Several issues can cause your AC to blow warm air instead of cooling your home. The most common culprits include refrigerant leaks, dirty air filters restricting airflow, frozen evaporator coils, or problems with the outdoor condenser unit. Sometimes the issue is as simple as a tripped circuit breaker or incorrect thermostat settings, but often it requires professional diagnosis to identify the root cause. Refrigerant problems, in particular, need proper handling by licensed technicians. Running your system when it’s blowing hot air can worsen the problem and increase repair costs, so it’s better to shut it off and call for service.
Most HVAC systems benefit from professional maintenance twice per year—once before the cooling season and once before the heating season. This schedule allows technicians to catch potential problems before they cause system failures during peak usage times. Regular maintenance includes cleaning components, checking refrigerant levels, testing safety systems, and replacing filters. Norfolk County’s climate puts significant demands on HVAC equipment, making consistent maintenance even more important for reliable performance. Our Comfort Club membership includes scheduled maintenance visits, so you don’t have to remember to call—we’ll contact you when it’s time for your system’s checkup.
Several indicators suggest it might be time to replace rather than repair your HVAC system. Age is a major factor—most systems last 15-20 years with proper maintenance. If you’re experiencing frequent breakdowns, rising energy bills despite normal usage, or inconsistent temperatures throughout your home, your system may be failing. Strange noises, excessive dust, or humidity problems also signal potential system issues. When repair costs start approaching 50% of a new system’s cost, replacement often makes more financial sense. A professional assessment can help you understand whether your current system can be restored to reliable operation or if replacement is the better investment.
Yes, HVAC emergencies don’t follow business hours, and we understand that losing heating or cooling on a weekend or holiday can be just as urgent as during the week. We provide emergency service when you have complete system failures that affect your home’s safety and comfort. True emergencies include situations like no heat during winter cold snaps or no cooling during extreme summer heat. Our emergency service focuses on restoring your comfort and safety, though some non-urgent repairs might be scheduled for regular business hours if parts need to be ordered. Dempsey Comfort Club members receive priority scheduling for all service calls, including emergency situations.