One of the questions that homeowners may have is, “Would it be better to replace the full system?”. It makes sense to ask, why would you want to replace a component that still works?

Replacing your furnace and AC at the same time, can be a cost-saving advantage to you. A Split HVAC system keeps your home nice and warm in the winter and cool in the summer. When the time comes to replace an old, worn out AC System, there are usually several options available. However, if one of the system’s major components stops working, the easy choice is to simply replace the part that’s broken. But replacing the full system, both your heating and cooling systems—even if one is still working—can save energy and money over the long term.

Keep reading to learn about the advantages and disadvantages of replacing a furnace and AC together.

HVAC Basics First, you should understand that Split HVAC Systems consist of several basic components, Condenser (outside unit), Air Handler (inside unit, evaporator coil & blower), Gas Furnace or Heat Kit, Ducts, Thermostat.

Lifespan of Furnaces vs Air Conditioner – The average lifespan of a central air conditioner is about 15-20 years while the average lifespan of a furnace is about 15-30 years. In general, furnaces last longer than air conditioners — sometimes over twice as long. Furnaces are less prone to corrosion & mechanical wear and tear.

Reasons to Replace both Furnace and AC at the Same Time

• Furnace is over 15 years old
• New System is a high-efficiency system
• Installation is complicated by space or accessibility
• Personal preference to have a totally new system

Energy Efficient Heating & Cooling

Modern high efficiency HVAC Systems are engineered to use much less energy than systems built just 10 to 15 years ago. The efficiency of HVAC Systems can be compared by SEER Rating. The higher the SEER Rating, the more energy savings you can expect.

AFUE Furnace Efficiency Rating is a measure of seasonal performance for Gas Furnaces. In general, an AFUE of 90% or higher is recommended for a new, efficient furnace system.

Furnace and AC Performance

Having a Matched System for High Efficiency Modern HVAC Systems are engineered to obtain a specific efficiency (SEER Rating). Often, the SEER Rating can only be achieved if the systems components are “matched”. In this situation, replacing the old system makes sense, because you’ll want the advantage of the energy savings & comfort level.

While it is usually necessary to replace both air conditioning components at the same time (in a split system), it’s not always necessary to replace both AC components and the furnace. It’s possible to mix and match the systems, it’s not recommended, especially if the furnace is over 15 years old. It makes sense to wait to replace your furnace if it is less than 10 years old. In this case, the furnace will likely last until the next time the AC needs to be replaced.

Mixing and matching a new HVAC Component with an old, inefficient component could potentially decrease the lifespan of the replacement component that you need. By replacing just one part of your overall HVAC system, you effectively lower the performance of both components. Your HVAC System won’t reach the full potential that is possible.

Also, be certain that you read and understand the manufacturers warranty. Many manufacturers will not honor the warranty in cases of system mismatches.

Matched HVAC Systems Complement Each Other

A furnace system and central air conditioning system share the same air handler. When an HVAC Contractor matches a condenser with an efficient handler that will allow both systems to operate properly, increasing energy cost savings, system lifespan and increasing heating & cooling comfort.

Saving Money on Home Heating and Cooling Costs

As we said before, modern HVAC systems are designed for increased efficiency. You will absolutely save money on your monthly energy bills if your new HVAC System is properly matched. The reason for the savings is because all components work together for maximum efficiency over time. New HVAC Systems require fewer repairs, and if a repair is needed, then parts will often be covered by the manufacturers warranty.

Reasons You Shouldn’t Replace a Furnace and AC at the Same Time

It’s not always the smartest choice to replace an entire HVAC System & there are situations where it’s a disadvantage.

Your HVAC System is Less Than 5 Years Old
If your HVAC System is only a few years old and nothing seems to be wrong with them, then there’s no reason to replace anything. However, if repair costs become significant, then it makes no sense to keep paying for repair of a failing component.

Limited Budget If a full replacement isn’t in your home repair budget, then it doesn’t make sense to force yourself into a sticky financial situation.

HVAC System add value to your home?

You can improve the overall value of your home by maintaining high-quality, compatible systems for heating and cooling. For maximum efficiency and cost savings, replacing the furnace and air conditioner at the same time, when possible, gives you reliable comfort and modern convenience. Adding a new HVAC System can increase the value of your home, and help to make the home more attractive to potential buyers.