Grafton Mechanical Services - Lisbon's Licensed HVAC Services

A cracked heat exchanger is a serious safety hazard, as it can leak carbon monoxide into your home's air. Key signs include a strange, chemical-like odor from your furnace, soot buildup around the burner, or a yellow, flickering flame instead of a steady blue one. Given our cold winters and heavy furnace use, this issue requires immediate attention. Our technicians perform precise inspections to detect cracks early and recommend safe, code-compliant repairs or replacements to protect your family.

Clogged condensate drains are very common here due to our humidity levels and airborne particles. The drain line removes moisture from your AC or high-efficiency furnace, and over time, algae, mold, and debris build up inside, causing water leaks and potential system shutdowns. At Grafton Mechanical, we perform a thorough drain line cleaning and can install preventative measures like UV lights or treatment tablets to inhibit growth, helping you avoid messy leaks and costly water damage.

Our local maintenance service is designed to catch small problems—like early signs of heat exchanger stress or drain blockages—before they become big headaches. A visit includes cleaning critical components, checking for gas leaks and carbon monoxide risks, testing electrical connections, calibrating your thermostat, and ensuring proper drainage. This proactive care improves safety, boosts efficiency to lower your bills, and extends the life of your system, giving you peace of mind through every New Hampshire season.