Should You Replace Furnace & AC Together?
Deciding to replace your heating and air conditioning system at the same time seems like a big investment. However, it’s a cost-effective option that increases comfort and efficiency. There are reasons that you may want to consider it, especially if one of your units is aging or not performing well.
When It Makes Sense to Replace Both
Furnaces and air conditioners work together as part of a whole-home system to ensure your family is comfortable throughout the year. While they operate separately, they often share components, like the blower motor, air handler, and ductwork. That means that when one needs a replacement, it may affect the performance of the other, especially if the new unit is more advanced than the older one. Read on to learn more about the signs your furnace might be failing and your air conditioner.
Both Are Over 10 Years Old
How old is your AC? If both units are more than a decade old, it’s usually more cost-effective to replace them together. Most air conditioners last about 15 years at most, and furnaces can operate for up to 20 years, but their efficiency drops off significantly as they get older. If one system is already near the end of its life, the other likely isn’t far behind. Replacing just one unit could mean you’re back in the same situation within a few years. Paying for another installation, more labor, and potential home disruptions.
Energy Efficiency Is an Issue
Modern HVAC systems are more efficient than those made just 10 years ago. New air conditioners feature high SEER2 (Seasonal Energy Efficiency Ratio 2) ratings, and modern furnaces boast AFUE (Annual Fuel Utilization Efficiency) ratings of at least 90%. However, mixing an old furnace with a new AC (or vice versa) can limit efficiency. You may not see the full benefit of a high-efficiency unit if the other half of the system is out of date.
System Compatibility Is a Concern
Some newer systems use variable-speed motors or two-stage compressors for more precise comfort control. These advanced features require communication between the furnace and air conditioner. If you install a new air conditioner but keep an old furnace, the two may not work together correctly, which can limit the benefits.
When Waiting Is Best
There are times when replacing only one unit is the better choice:
- Furnace under warranty and running efficiently
- Budget constraints making full replacement unrealistic
- One system with a recent replacement
In these cases, work with one of our licensed HVAC technicians to make sure your old and new units are properly sized and compatible. We can also advise on whether partial upgrades will limit performance.
Benefits of Replacing Your Furnace and Air Conditioner Together
When both units are new, you’re less likely to face surprise breakdowns, costly emergency repairs, or gaps in home comfort. That peace of mind is worth a lot, especially during heat waves. Here are several reasons why doing both at once can be a smart move.
Improved Performance
When your furnace and air conditioner are part of a matched system, they work together to achieve maximum airflow, temperature control, and efficiency. You’ll get more consistent comfort and better humidity control throughout your home.
Lower Installation Costs and Higher Energy Savings
Installing both units at the same time generally costs less than replacing them separately. Upgrading both to high-efficiency models will also help you save on heating and cooling expenses. Expect a noticeable drop in utility bills after switching to a matched high-efficiency system.
Aligning Warranties
With the simultaneous installation of both systems, their warranties begin at the same time and usually cover similar terms. That means less confusion about coverage, and if something does go wrong, you’ll have protection.
Contact a Reliable HVAC Contractor
Replacing your furnace and air conditioner together isn’t always necessary, but in the right situation, it’s a smart investment. Ultimately, the best decision depends on the condition of your current system, your goals for comfort and energy efficiency, and your budget. At Isaac Heating & Air Conditioning, we can help you evaluate your options and make a recommendation that’s right for your home and budget.
As a family-owned HVAC company that serves Western and Central New York, we have a team that you can trust. Contact us at Isaac Heating & Air Conditioning today to schedule an appointment.
