You should replace your heater when it is 15 to 20 years old, requires frequent or expensive repairs (using the the 50% rule, where a repair costs more than half the value of a new unit), or shows signs of a cracked heat exchanger.
Here are five signs you may need to replace your heating system.
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.
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.
If your electric heater is causing dizziness, you should immediately turn it off, unplug it, and get to fresh air. Dizziness can be a sign of oxygen depletion, the buildup of toxic gases, or off-gassing from a malfunctioning or brand-new appliance.
Symptoms to Watch For
If you're experiencing frequent headaches, dizziness, nausea, or flu-like symptoms, your heater could be the culprit. Dry skin, irritated eyes, or worsening allergies are also common signs that your heating system might be circulating dust, mold, or other allergens.
Cardiac dizziness usually feels like a sudden sensation of lightheadedness, wooziness, or the feeling that you might faint (presyncope). It happens because your brain isn't receiving enough blood flow, typically stemming from an irregular heartbeat, a heart attack, or poor heart function.
In most homes, Heating and Cooling (HVAC) systems drive the highest energy costs, accounting for nearly 40% to 50% of your total electricity bill. Following these, the appliances that run up your bill the most include water heaters, refrigerators, and laundry machines.
Heating and energy expert Stephen Hankinson said that one "big energy cost saver" is to make sure you have your heating off when you're not at home. For instance, if you typically arrive home from work at around 6pm on weekdays, you could set your heating to activate just as you walk through the door.
A detailed study from the National Renewable Energy Laboratory found residents preferred a wintertime heater setting between 67 °F and 70 °F (19 °C to 21 °C). The Department of Energy recommends a winter heat setting of 68 °F (20 °C), which matches up very well with the temperatures most of us are comfortable with.
5 Warning Signs It's Time for Furnace Replacement
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.
The best time to buy a furnace is during the off-season, specifically late spring (April-May) or early autumn (September-October), when HVAC companies are less busy and offer lower prices, rebates, or promotions. Purchasing in these shoulder seasons ensures faster installation times and better negotiating power compared to winter peak season.
Yes HVAC prices have steadily increased over the past few years, and 2026 is no exception. These increases are affecting everything from entry-level systems to high-efficiency units, making it more expensive than ever to install or replace HVAC systems.
What fails first on a furnace? The most common early failures are the furnace ignitor or flame sensor, as they experience regular wear and tear and are critical to starting the heating cycle.
You should probably Replace if: [ ] The repair costs more than 50% of a new unit. [ ] The furnace is over 15 years old. [ ] You have had to repair it more than once in the last 2 years.
If you have a boiler, then no – keeping your heating on all the time will use more energy and cost you more money. It's more energy efficient, and better for your bills, to have your boiler come on when you need it. But if you have a heat pump, then you can save money by leaving the heating on all day.
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.
For most customers, we recommend turning on your furnace when the weather is consistently below 18° Celsius, which usually happens to be around the end of September, or early October. Some homeowners try to put off turning on their furnace as long as they can to save money, which is okay if you're healthy adults.
The Top Energy-Draining Appliance: Space Heating & Cooling
This includes both forced-air systems, heat pumps, furnaces, baseboards, window A/C units, and fans. Because they run for long periods and often at high wattage, they dominate the consumption profile.
Heating and cooling (HVAC systems)
Heating and air conditioning are the largest sources of residential electricity use in most climates. According to the U.S. Energy Information Administration, space heating and cooling together account for more than 50% of a home's annual energy consumption.
The fix: Lower your home temperature to 68 degrees when you're home. Maintain comfort by adding extra layers of clothing – try fabrics like fleece, flannel and wool – and don't forget comfy slippers and blankets. If you can comfortably go a degree or two cooler than 68, your wallet will benefit even more!
Symptoms of heart failure
breathlessness after activity or at rest. feeling tired most of the time and finding exercise exhausting. feeling lightheaded or fainting. swollen ankles and legs.
For the elderly, dizziness is a major fall risk and should never be ignored. Immediate medical evaluation is required if dizziness is accompanied by sudden neurological deficits or cardiac symptoms, as these can indicate a stroke or heart event.
Heart failure can occur at any age, from birth (due to congenital defects) to adulthood. However, it is primarily a condition of older adults, with the risk rising sharply after age 65.