If your heat isn't turning on, the most common culprits are incorrect thermostat settings, tripped circuit breakers, a dirty air filter, or obstructed outdoor exhaust vents.
Check the Thermostat
For homes with electric units, make sure the circuit breaker hasn't been tripped. Then for gas units, make sure the system has enough fuel to run efficiently. One last measure to take if it's due to the power source is checking if the gas control valve is set to “on.”
When your heating stays on despite being switched off at the thermostat or control panel, it is usually caused by a faulty zone/motorized valve, a stuck boiler relay, miswired controls, or incorrect thermostat settings.
A properly functioning and correctly sized furnace should typically run for a sustained cycle of at least 7 to 12 minutes. The run time largely depends on the outside temperature and your home's insulation, but generally, the furnace should cycle off only a few times an hour (3 to 8 times).
During the winter months, most people feel comfortable at 68-72°F (20-22°C) indoors. Lower temperatures (around 64-66°F/18-19°C) can still be healthy if you dress accordingly, but temperatures much below that may cause discomfort, especially for children and elderly individuals who lose body heat more quickly.
It takes time for your home to warm up and cool down. If you're not sure how long it takes, try turning the heating on about 30 minutes before you need it. You should turn it off 30 minutes before you'll stop needing it.
How can you tell if a thermostat is bad?
It's very easy for things in your home to catch fire if placed too close to a fan heater. Also, try to keep children and animals away from fan heaters. It's possible that they could drop or poke something through the vents and onto the metal coil, which may start a fire, and puts them in danger if they're too close.
You can tell a circulator pump is bad by checking for uneven heating (cold radiators), unusual grinding or humming noises, and visible water leaks or rust. If the pump casing feels excessively hot but the attached outlet pipes remain cold, the pump is likely failing to move water.
Prevent further system damage
Turning off HVAC when it isn't heating helps prevent extra wear on critical components like the blower motor, heat exchanger, or control board while you diagnose or wait for repairs.
A frozen pipes furnace failure can cause major problems inside your home. Ice builds up fast in unheated spaces, and when frozen water expands, it can burst pipes wide open. That kind of mess is the last thing anyone wants during a winter heating outage.
Your first indication that you need furnace repair might be:
When your thermostat won't turn off the heat, the quickest fix is to pop the thermostat faceplate off the wall or manually flip the system switch to "Off". This cuts the signal to your furnace. Next, check your fan settings—if the fan is set to "On" instead of "Auto," it will run constantly even when the heat isn't actively blowing.
The $5,000 rule is a guideline to help homeowners decide whether to repair or replace their HVAC system. You multiply the age of your unit by the cost of the needed repair. If that number exceeds $5,000, replacing your HVAC system is often more cost-effective.
The heat exchanger is often considered the most costly part of a furnace to repair or replace. It is a critical component that transfers heat from the combustion process to the air that circulates throughout your home. Over time, heat exchangers can crack due to the constant heating and cooling cycles they undergo.
Electrical fire warning signs include persistent burning or rubbery odors, warm or discolored wall outlets, and frequent circuit breaker trips. You should also watch for flickering lights, unusual buzzing sounds, or sparks when plugging devices in. These indicators often point to dangerous wiring issues or overloaded circuits.
Use this information as a safety guide for choosing, installing and using space heaters in your home. These heaters are fueled by kerosene, natural gas, propane or electricity. All of these heaters can cause fires. Gas and kerosene heaters can cause buildup of carbon monoxide and nitrogen dioxide in your home.
Fire departments responded to an estimated average of 37,365 fires involving heating equipment per year from 2020-2024. This accounted for 11% of all reported home fires during this time, and these fires resulted in estimated annually 417 civilian deaths, 1260 civilian injuries, and $12 billion in property damages.
A failing thermostat usually shows clear signs: the HVAC or engine behaves erratically, the screen is blank, or the temperature in your home/car does not match the settings.
Average Lifespan of a Thermostat
With a straightforward design and basic scheduling features, they are reliable workhorses that can last 10 to 15 years with proper care. Routine programming updates and occasional recalibrations go a long way toward keeping them accurate and extending their usefulness.
A plumber isn't usually needed for thermostat replacement unless your thermostat directly controls a water-based heating system, such as underfloor heating or a boiler with complex plumbing connections. Even then, an electrician is typically the right professional to handle the wiring.
How many hours should my heating be on a day? For most modern homes, Patrick Garner, Gas Safe Engineer at Heatable, tells us that having your heating on for 4-6 hours a day, "split between short boosts at the times you actually need warmth", is a good general rule.
Heating and cooling (HVAC) systems are the biggest energy consumers in a typical house, accounting for roughly 45−50% of your total electricity usage. Water heaters, refrigerators, and lighting round out the rest of the major draws.
Answer: OSHA does not require employers to provide heat or air conditioning for work spaces. OSHA does recommend temperature control in the range of 68-76°F.