Colonial Oil - Chelmsford's Licensed HVAC Services

Absolutely. A malfunctioning thermostat is a common issue in our area that can lead to uneven heating or cooling and higher energy bills. Our HVAC technicians can diagnose the problem, whether it's a wiring issue, dead batteries, or a faulty unit, and perform the necessary repair or calibration. For older models, we can also advise on and install modern, programmable thermostats to improve your home's comfort and efficiency.

We recommend checking your HVAC air filter every month, especially during peak heating and cooling seasons. For most Chelmsford homes, replacing standard 1-inch filters every 1-3 months is a good rule of thumb. Clogged filters are a frequent cause of reduced airflow, strain on your system, and poor indoor air quality. As part of our HVAC maintenance services, we can check your filter and advise on the best type and replacement schedule for your specific system.

Yes, we offer preventative maintenance plans designed to address the common issues Chelmsford homeowners face. Our thorough check-ups include inspecting and cleaning components, checking thermostat operation, replacing air filters, and ensuring your system runs efficiently. Regular maintenance helps prevent unexpected breakdowns, extends the life of your equipment, and can improve your home's air quality and energy efficiency.