Fast, Reliable Heat from the Local Experts

When your furnace, boiler, or heat pump stops working, you need dependable service — not delays. At A&S Nathan Heating and Cooling LLC, we deliver trusted heating repair in Derby, CT, restoring warmth quickly and professionally. Located right here in the Valley, our family-owned company has been helping local homeowners since 2000. Whether your system runs on oil, gas, or propane, our technicians have the training and tools to get your heat back on fast.

We Repair All Heating Systems

Our licensed technicians handle all system types and brands, including:

Gas & Oil Furnaces – Ignition issues, motor failures, or poor airflow corrected efficiently.
Steam & Hot-Water Boilers – Pressure loss, leaks, or inconsistent heating solved fast.
Propane Heating Systems – Venting and combustion adjustments for safe operation.
Heat Pumps & Hybrids – Defrost, refrigerant, and electrical problems diagnosed accurately.
Ductless Mini-Splits – Zoning and sensor repairs for reliable comfort in every room.

Our fully stocked trucks allow most repairs to be completed in one visit.

Common Heating Problems in Ansonia Homes

System blowing cold air
Uneven heat between rooms
Strange noises or smells
Frequent cycling or short run times
High utility bills

We perform a complete diagnostic inspection and provide upfront, flat-rate pricing before any work begins.

Local Service You Can Trust

As your neighbors in the Valley, we understand Derby homes — from downtown multi-families to hilltop colonials. We proudly serve Derby, Ansonia, Seymour, and Shelton, offering 24/7 emergency repair service when the heat goes out.