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Furnaces

Heat air and distribute it through ducts. Gas and electric models have different operating costs and installation needs. This collection explains the main equipment formats, selection criteria, installation questions and upkeep for this system.

How furnaces work

A heat exchanger warms supply air while a blower distributes it through ductwork. Combustion gases in fuel-fired equipment must be vented safely.

Performance in a real building depends on the equipment, the distribution path and the installation. Compare a specific product's published specifications with the needs of the room or building before treating a retail listing as a complete solution.

Types and configurations

Natural-gas, propane, oil and electric units; single-stage, two-stage and modulating output.

Different configurations can share a category name while having very different electrical, duct, piping and control requirements. Confirm the exact model and components included in any quote.

Where they are used

Buildings with existing forced-air ductwork. A professional assessment should establish the required capacity and identify any site constraints, especially for permanently installed equipment.

What to compare

Compare AFUE, fuel availability, required input/output capacity, blower compatibility, and venting. Electric resistance heat has a different cost profile from gas.

Fuel availability, AFUE, capacity, venting, and duct condition. Review warranty conditions and installation requirements along with the headline rating.

HVAC equipment installation illustrating this collection
Illustrative HVAC equipment image. Product appearance varies by model.

Technical details that matter

A gas furnace heats air at a heat exchanger while combustion products leave through a flue. AFUE describes seasonal fuel efficiency, not the maximum heat output or the cost of electricity used by the blower. A condensing model may need different venting and a condensate drain from an older installation.

Example application

A replacement quote should distinguish input capacity from delivered output, state the AFUE rating and describe how the blower will work with existing AC equipment and ducts.

Installation and ownership

Allow for equipment, compatible components, labor, controls, site work and any local requirements in the total cost. Published retailer prices represent the stated equipment only unless the listing explicitly includes more.

Replace filters, keep vents open, and schedule combustion and safety checks for fuel-fired units.

Before placing an order: ask for exact model numbers, capacity calculations where appropriate, electrical and mechanical scope, commissioning steps and separate equipment and labor warranties.

Source

US Department of Energy: Residential Furnaces ↗

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HEATING

Boilers

Heat water for radiators, baseboards, or radiant floors. They do not provide cooling on their own.

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Radiant heating

Deliver warmth through floors or other surfaces using water or electric elements.

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Baseboard heaters

Provide room-by-room heating with electric resistance or hot-water circulation.

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