Connecticut homes use a mix of heating systems — boilers with radiators, forced-air furnaces, and increasingly, heat pumps. If your heating system needs replacement, understanding the differences between boilers and furnaces helps you make the right choice.
Boilers: How They Work
A boiler heats water and distributes it through radiators, baseboard heaters, or radiant floor systems. The heated water radiates warmth into each room. Common in older Fairfield County homes (pre-1970s), boilers provide even, comfortable heat.
Types of Boilers We Install
- Gas boilers — most common in CT, efficient and reliable
- Oil boilers — common in older homes, especially in rural areas
- High-efficiency condensing boilers — 95%+ AFUE, extract more heat from combustion gases
- Combi boilers — provide both space heating and domestic hot water in one unit
Furnaces: How They Work
A furnace heats air and blows it through ductwork to every room. A blower fan pushes warm air through supply ducts and cold air returns through return ducts. Common in newer construction and ranch-style homes.
Types of Furnaces
- Gas furnaces — 80%–98% AFUE, most popular in areas with natural gas
- Oil furnaces — less common, used where natural gas isn't available
- Electric furnaces — 100% efficient but expensive to operate in CT
Head-to-Head Comparison
| Factor | Boiler | Furnace |
|---|---|---|
| Installed cost | $5,500–$15,000+ | $3,500–$10,000+ |
| Efficiency (AFUE) | 80%–98% | 80%–98% |
| Distribution | Radiators/baseboard/radiant | Forced air ducts |
| Comfort quality | Excellent — even, quiet, no drafts | Good — can be drafty, noisier |
| Air quality | Doesn't blow dust/allergens | Can circulate dust (filterable) |
| Lifespan | 20–30+ years | 15–20 years |
| Maintenance cost | Moderate | Lower |
| AC compatible | Needs separate AC system | Shares ductwork with AC |
| Response time | Slower (heats water first) | Faster (immediate warm air) |
| Freeze risk | Yes (pipes can freeze) | No |
Which Is Better for Your CT Home?
Keep your boiler if:
- Your home already has radiators or baseboard heat
- You value quiet, even heat without drafts
- You have family members with allergies (boilers don't blow air)
- You're replacing an existing boiler — the infrastructure is already there
Choose a furnace if:
- Your home already has ductwork
- You want AC and heating to share the same distribution system
- You're building new and want lower installation costs
- You want a fast-heating system
Consider a heat pump if:
- You want both heating and cooling from one system
- You want to reduce your carbon footprint
- You're interested in the best available rebates and tax credits
- You have oil heat and want to switch to a more economical system
Brands We Recommend
Boilers: Weil-McLain, Burnham, Navien (condensing), Buderus
Furnaces: Carrier, Goodman, Rheem, Lennox
Heat Pumps: Mitsubishi, Fujitsu, Carrier, Daikin
Need HVAC help in Fairfield County CT or Westchester County NY? Call (866) 203-0469 or get a free estimate online.