The Heat Handbook Team 
Last updated: July 2026 · Based on 2026 US installed pricing A heat pump costs $4,000 to $9,000 installed for a typical ducted air-source system in 2026, with most homeowners paying around $5,500–$7,000. But the full range is wide — a single-zone ductless mini-split can start near $3,500, while a geothermal system runs $15,000–$35,000. What … Read more
Last updated: July 2026 · Reviewed against Carrier, Goodman and Mitsubishi service documentation Some frost on a heat pump’s outdoor unit in winter is completely normal — a light coating that the defrost cycle melts away every hour or two. But a unit fully encased in ice is a problem. The causes range from a … Read more
Last updated: July 2026 · Reviewed against Carrier, Goodman and Mitsubishi service documentation A heat pump not cooling usually points to a thermostat setting, a dirty filter or coil, low refrigerant, or a stuck reversing valve. Since a heat pump is essentially an air conditioner that can run in reverse, most cooling problems mirror AC … Read more
Last updated: July 2026 · Reviewed against Carrier, Goodman and Mitsubishi service documentation A heat pump not heating usually comes down to a thermostat setting, a dirty filter or coil, a refrigerant problem, or the unit being stuck in defrost. Because a heat pump both heats and cools, some “no heat” complaints are really settings … Read more
Last updated: July 2026 · Based on Lennox integrated control (board) diagnostic flash codes A blinking red light on a Lennox furnace is the control board telling you exactly what is wrong — in code. The blink pattern (slow flash, fast flash, or a number of flashes) maps to a specific fault, from a normal … Read more
Last updated: July 2026 · Reviewed against Carrier, Goodman and Trane service documentation Water pooling around your furnace is almost always one of two things: a clogged condensate drain on a high-efficiency furnace, or condensation from a problem with a standard-efficiency furnace’s flue. It is rarely an emergency, but you should find the source quickly … Read more
Last updated: July 2026 · Reviewed against Carrier, Goodman and Trane service documentation Short cycling — when your furnace turns on and off every few minutes without completing a full heating cycle — is one of the most common furnace complaints, and one of the most important to fix quickly. Beyond the annoyance and the … Read more
Last updated: July 2026 · Reviewed against Carrier, Goodman and Trane service documentation If you have no air at all rather than cold air, see furnace not blowing hot air. A furnace blowing cold air usually comes down to one of five things: a thermostat set to “ON” instead of “AUTO”, a dirty flame sensor … Read more
Last updated: July 2026 · Reviewed against A.O. Smith, Rheem and Bradford White service documentation A water heater leaking from the drain valve is one of the most common and least expensive water heater leaks to fix — often for under $15. The drain valve is the spigot at the base of the tank used … Read more
Last updated: July 2026 · Reviewed against A.O. Smith, Rheem and Bradford White operating instructions Knowing how to turn off your water heater is essential in an emergency — a leak, a burst tank, or before any repair. The steps differ depending on whether you have a gas or electric unit, and there are actually … Read more