Filterbuy Resource Hub

HVAC Systems

From furnaces and heat pumps to central AC, every HVAC system depends on the same basics: proper filtration, regular maintenance, and knowing the warning signs before small problems become expensive repairs. This hub covers system types, troubleshooting, installation costs, and the maintenance habits that keep any HVAC system running efficiently.

Common HVAC System Types

Most homes rely on one of these core system types — each with its own maintenance and filter needs.

Furnace

Burns gas, oil, or uses electric resistance to generate heat, distributed through ductwork. The most common heating system in colder climates.

Heat Pump

Moves heat rather than generating it, providing both heating and cooling from one system. Increasingly popular as an energy-efficient alternative to separate furnace and AC units.

Central Air Conditioner

Cools and dehumidifies air through the same ductwork as your furnace, usually paired with it as a combined heating-and-cooling system.

Ductless Mini Split

Heats and cools without ductwork, ideal for additions, garages, or homes where central air isn't practical.

Good to know: whatever system you have, filter condition affects nearly every common problem — reduced airflow, higher energy bills, short-cycling, and premature component wear all trace back to filtration far more often than homeowners expect.

Frequently Asked Questions

How often should I schedule HVAC maintenance?

A professional tune-up once a year is standard — typically in spring for AC systems and fall for furnaces — on top of regular filter changes every 1–3 months.

What's the difference between a heat pump and a furnace?

A furnace generates heat by burning fuel or using electric resistance. A heat pump moves existing heat from one place to another, which makes it more energy-efficient in moderate climates and capable of both heating and cooling.

Why is my AC running but not blowing cold air?

Common causes include a clogged filter restricting airflow, low refrigerant, a frozen evaporator coil, or a failing compressor. A dirty filter is the most common and easiest to rule out first.

How much does it cost to replace an HVAC system?

Costs vary widely by system type, home size, and region — factors like ductwork condition, efficiency rating, and labor rates in your area all affect the final price. Getting multiple local quotes is the most reliable way to budget accurately.

Do heat pumps work in cold climates?

Modern cold-climate heat pumps perform well well below freezing, though efficiency drops as temperatures fall. Many cold-climate installations pair a heat pump with a backup heat source for the coldest days.

How long should an HVAC system last?

Furnaces typically last 15–20 years, central AC units 10–15 years, and heat pumps around 15 years — consistent filter changes and annual maintenance are the biggest factors in reaching (or exceeding) that range.

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