New furnaces are generally better than old ones because of massive leaps in energy efficiency and comfort. However, some homeowners prefer the heavy-duty cast-iron build of older units. To decide which is better for you, compare the following key differences:
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.
Furnaces typically last 15 to 20 years, but well-maintained units can often operate longer. If your furnace is 25 years old, it likely means you've been maintaining it properly by scheduling annual maintenance and routine care. However, its age puts it at a higher risk for increased repairs and a complete breakdown.
Most furnaces installed 20 years ago operate at around 60 to 80 percent efficiency. That means a large portion of the fuel you pay for is wasted instead of being converted into heat. Modern furnaces, by comparison, often operate at 90 percent efficiency or higher.
When choosing a furnace, the best brand depends on what you prioritize: reliability, high-end efficiency, or budget-friendly value. Based on industry consensus and consumer ratings, the top three furnace brands are Carrier, Trane, and Lennox.
A standard residential furnace lasts 15 to 20 years. However, the exact lifespan varies based on the type of system and how well it is maintained.
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.
Have HVAC Prices Gone Up in 2026? 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.
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.
5 Warning Signs It's Time for Furnace Replacement
If the furnace is 15 years or older, then it's likely that a full replacement is needed. In addition to the age of the unit, here are a few things that you should look for to determine whether it's time to replace your furnace: Constant emergency repairs. Increased energy costs.
Repair vs Replacement of a 30-Year-Old Furnace? In most cases, replacing your 30-year-old furnace is the better choice. It will cost you less money overall, lower your energy bills, heat your home better, and eliminate the worry of it breaking down during the cold winter.
Furnace Tax Credit Amounts and Limits for 2025
Federal HVAC tax credits allow homeowners to claim a maximum annual credit of up to $3,200 for qualifying HVAC upgrades made between 2023 and 2025.
Most 2,000-square-foot homes need a furnace between 50,000 and 65,000 BTUs, depending on climate and insulation. Colder regions or older homes may need more heating power, while well-insulated houses in mild climates may need less.
Yes, you can replace just your furnace without replacing your AC. Knowing whether you should look at a furnace replacement only or AC replacement only, or both at the same time depends on many variables, and we will look at reasons for and against the question.
The best time to buy a new HVAC system is during the off-peak seasons, particularly in winter months (December through February) and early fall (September through October).
Many Amish homes are built with plenty of windows to help circulate the air and bring in the cooler overnight temperatures. They open the windows on the top floors to help the heat escape while the family retreats to the lower grounds within their homes for comfort.
Shop around. Getting competitive bids from several contractors will save you money. For large installation jobs, it's common for company-to-company price differences to exceed $1,500 for the same equipment and work. Even for smaller installation jobs, prices vary considerably.
Set your thermostat to 𝟔𝟖 ∘𝐅 while awake and home. For maximum efficiency and savings, lower the temperature to 𝟔𝟎 ∘𝐅 – 𝟔𝟒 ∘𝐅 while sleeping or when away from the house for the day.
Average Furnace Installation Cost Range
A new furnace installation typically ranges between $4,000 and $8,000, depending on system type and efficiency. This total is an all-inclusive number, including the new furnace, labor, removal of the old unit, and minor ductwork adjustments.
Type of Furnace
Some types of furnaces are more durable than others. For example, oil furnaces are built to last longer but may require more frequent maintenance. Gas and electric models, while easier to maintain, may have shorter lifespans.
Homeowners insurance may cover furnace damage from sudden and accidental perils, such as fire, storm damage, burst pipes, or electrical surges. Damage from normal wear and tear, poor installation, aging, or lack of maintenance is not covered by standard policies.
Replacing your furnace before it breaks down lets you avoid unexpected costs and stress. A dying furnace can lead to increased energy use, higher bills, and safety issues like carbon monoxide leaks. Upgrading before your system dies means you'll have the time to make the best choice for your home.