Heating Systems Guides & Calculators
In-depth guides covering furnaces, space heaters, water heaters, sizing calculators, and more
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Furnaces & Central Heating
Gas, electric, and oil furnaces, boilers, and central heating systems
Boiler vs Furnace: Which Heating System Is Better? (2026 Comparison)
Boilers and furnaces compared: how each heats, comfort, efficiency ratings and federal minimums, running cost on the same fuel, cooling and ductwork, and which fits your home.
Cold Air Return Vents: How They Work, Placement and Sizing (2026)
What cold air return vents do, why every room needs a path back to the system, placement high or low, filter grilles, sizing returns for airflow, and the mistakes that starve a system of air.
Cracked Heat Exchanger: Signs, Dangers and What to Do (2026)
What a cracked furnace heat exchanger is, why it's a carbon monoxide risk, the warning signs, what causes cracks, how technicians confirm one, and what to do while you wait.
Furnace Blowing Cold Air? Causes and Fixes (2026)
Why a furnace blows cold air: thermostat fan settings, warm-up delay, dirty filters and overheating, flame sensor and ignition problems, condensate clogs, and when to call a technician.
Furnace Filter Direction: Which Way Does the Arrow Go?
Which way the arrow on a furnace filter points, how to tell at a wall return, a furnace slot or a horizontal furnace, what happens if it's backwards, and how often to change it.
Furnaces: A Homeowner's Guide to Gas, Electric and Oil (2026)
How gas, electric and oil furnaces work, AFUE and the 2028 95% rule, sizing, typical costs, running costs by fuel, lifespan and maintenance.
Furnace Installation Cost (2026 Guide): Gas, Electric, Oil and Dual Fuel
Typical furnace installation costs by type and efficiency, what drives the price, the 2028 federal 95% AFUE rule, running-cost payback between 80% and 95% furnaces, and which rebates apply.
Furnace Leaking Water? Causes and Fixes (2026)
Why a furnace leaks water: condensate drain clogs on high-efficiency furnaces, the AC coil, a humidifier, or venting problems on older furnaces, what you can check yourself, and when to call a pro.
Furnace vs Heat Pump: Which Is Better? (2026 Cost and Climate Comparison)
Furnace and air conditioner vs. heat pump compared on yearly running cost and carbon in five climates, what changes the answer, install prices, rebates and comfort.
How Many Watts Does a Gas Furnace Use? (Blower Motor Power, 2026)
How much electricity a gas furnace uses for its blower, inducer, igniter and controls, how to find your furnace's watts, what it costs to run, and what it means for generators and batteries.
Gas vs Electric Heating: Which Is Cheaper? (2026 Cost Calculator)
Gas vs electric heating compared for the same heat delivered: cost per million BTU, when a heat pump beats gas, and the calculator's results for furnaces, water heaters and dryers.
How Much Gas Does a Pilot Light Use? (Cost per Month and Year, 2026)
How much gas a standing pilot light burns and what it costs, per 1,000 BTU of pilot input, where pilots are still found, whether to turn one off, and electronic ignition.
What Temperature Should I Set My Thermostat in Winter? (2026)
How to set your thermostat in winter: the DOE's setback savings, comfort and humidity, sleeping and away settings, heat pump cautions, and how a programmable or smart thermostat helps.
Tankless Water Heaters
On-demand water heating systems and sizing guides
Hot Water Recirculating Pumps Explained (+ How They Work With Tankless)
How hot water recirculating pumps work, dedicated-line vs. crossover systems, timer and on-demand controls, the water they save, what they cost to run, and using one with a tankless heater.
How Much Does a Tankless Water Heater Cost? (Unit + Installation, 2026 Guide)
Typical installed costs for gas and electric tankless water heaters, what drives the installation price, running-cost payback against a tank, and which rebates still apply.
Tankless Water Heaters: Gas vs Electric (2026)
How tankless water heaters work, gas vs electric, sizing, installation needs, running costs against a tank, maintenance, and the common misconceptions.
How Much Propane Does a Tankless Water Heater Use? (2026)
Propane use and cost for a tankless water heater per hour, day and year, compared with a propane tank and natural gas, plus how to size the propane tank and supply.
Water Heaters
Traditional tank water heaters and maintenance guides
Electric Water Heating Cost & kWh Usage: State-by-State Analysis (2026)
What an electric water heater costs to run by household size, tank type and state, using EIA's 2026 rates, plus how a heat pump water heater and time-of-use rates change it.
Heat Pump Water Heaters: Are They Worth It? (2026 Hybrid Water Heater Guide)
How heat pump water heaters work, what they cost to run against electric and gas tanks, operating modes, installation needs, climate and noise, rebates, and who should skip one.
How Long Does a Water Heater Last? Lifespan by Type & Replacement Signs (2026)
How long tank, tankless, heat pump and solar water heaters last according to the DOE and ENERGY STAR, the signs a water heater is failing, and when to replace one.
Water Heaters: Tank vs Tankless, Sizing and Efficiency (2026 Guide)
The main water heater types compared on running cost, lifespan and installation, how to size one, what UEF ratings mean, rebates, and maintenance, with links to every tool.
Featured Heating Guides
Furnaces: A Homeowner's Guide to Gas, Electric and Oil (2026)
How gas, electric and oil furnaces work, AFUE and the 2028 95% rule, sizing, typical costs, running costs by fuel, lifespan and maintenance.
Furnace vs Heat Pump: Which Is Better? (2026 Cost and Climate Comparison)
Furnace and air conditioner vs. heat pump compared on yearly running cost and carbon in five climates, what changes the answer, install prices, rebates and comfort.
Gas vs Electric Heating: Which Is Cheaper? (2026 Cost Calculator)
Gas vs electric heating compared for the same heat delivered: cost per million BTU, when a heat pump beats gas, and the calculator's results for furnaces, water heaters and dryers.
Tankless Water Heaters: Gas vs Electric (2026)
How tankless water heaters work, gas vs electric, sizing, installation needs, running costs against a tank, maintenance, and the common misconceptions.
Water Heaters: Tank vs Tankless, Sizing and Efficiency (2026 Guide)
The main water heater types compared on running cost, lifespan and installation, how to size one, what UEF ratings mean, rebates, and maintenance, with links to every tool.