Furnace Repair
A regularly maintained furnace helps ensure a comfortable, safe home that’s heated to the desired temperature while reducing the risk of carbon monoxide exposure. Changing your furnace filter a couple of times per year is important, but your system requires more comprehensive maintenance to operate efficiently and catch wear or safety issues before they become more serious problems.
As HVAC technicians serving Connecticut households for decades, MJ Fahy & Sons performs all types of furnace repairs, from installing new systems to upgrading older appliances to routine furnace repairs and maintenance. Learn more about what we do and how we can support your home’s warmth, efficiency and safety.

Common Furnace Issues
When might you need a professional HVAC technician to inspect your furnace? Contact us if you notice any of the following issues:
- The furnace doesn’t turn on
- Old, dirty or clogged filters
- A flickering or blown-out pilot light
- A cracked or damaged heat exchanger
- Rumbling, scraping, rattling or squealing noises – often signs of a damaged part or loose panel
- A furnace that cycles on and off repeatedly
- Cold air blowing from vents or no airflow at all
- Uneven heating, with some rooms warmer than others
- Strange odors coming from the furnace, including a sulfur or rotten egg smell
- Higher energy bills without a noticeable change in usage
How We Can Service Your Furnace
Notice any of the concerns above? MJ Fahy & Sons offers a combination of the following furnace services:
- We work with all types of heating systems. This includes traditional forced-air furnaces powered by natural gas, oil or propane, as well as electric furnaces, boilers and heat pumps.
- We thoroughly clean your system. Poor furnace performance often stems from soot buildup or corrosion in the combustion chamber. In other cases, dust, hair and debris may clog ductwork, restricting airflow and forcing your system to work harder.
- We inspect your full system. Our technicians examine all furnace components to evaluate performance and identify parts that may need repair or replacement. We also inspect the flue pipe, which safely vents exhaust gases outside your home, for corrosion, damage and proper alignment.
- We recommend and perform part replacements. From routine air and oil filter replacements to worn or corroded components, we install durable, efficient parts designed to keep your furnace running reliably.
- We make energy-efficient repairs. Heat loss from leaky windows, doors or poor attic insultation can cause your furnace to work overtime and dive up energy costs. We’ll also help you optimize thermostat settings to conserve energy without sacrificing comfort.
- We address carbon monoxide safety. For added peace of mind, we can inspect or install carbon monoxide detectors to ensure your home is protected from potential exposure risks.
The Importance of Maintaining Your Furnace
Having a professional regularly assess your furnace can:
- Improve energy efficiency, reducing fuel consumption and lowering monthly heating costs.
- Extend furnace lifespan, often providing 15 to 30 years of dependable performance
- Protect your household’s safety by minimizing the risk of carbon monoxide exposure
Think it’s time to schedule professional furnace service? Whether you’re due for routine maintenance or checking on an unusual sound, contact MJ Fahy & Sons today.



