Should I Replace the Furnace When Replacing the Air Conditioner?

HVAC systems require regular maintenances to prevent them from breaking down abruptly. This is because they are such an essential component in your home that offers comfort throughout the year. However, maintenances and repairs are, to some extent, not sufficient.


Replacing old and damaged systems goes a long way in solving issues such as substantial repair bills, frequent malfunctions, and accidents. The HVAC system comprises an AC and a furnace, which work in sync to cool indoor air in your home. After some time, it’s always recommended replacing the AC due to several reasons. This then begs the question, should this replacement be done on the furnace too? Let’s try to break it down.

Functions of the Furnace in the HVAC System

You need to understand how the furnace works in case of an emergency so that you can quickly troubleshoot problems. The furnace is usually installed inside your house and attached to the condensing unit, thermostat, and ventilators.

Here are the steps which it takes the furnace to heat indoor air.

  1. The thermostat in your home detects temperature changes and signals both the furnace and the blower fan in the AC,
  2. Outdoor air blows into the furnace and gas or fuel source of your furnace start heating the air,
  3. The temperature of the air rises, and warm air is pushed to through the ductwork,
  4. After the air temperature reaches the desired level, the thermostat sends a signal which shuts of the furnace and the blower motor

This process is a continuous cycle that ensures that you are having a regulated environment inside your home, even when the outdoor weather conditions are unbearable.

However, these machines can’t practically provide service forever, even when taken good care of. Thus, there comes a time when you have to consider replacing a unit or the whole. To help us determine what needs to be changed, let’s see how long they can work.


Average Lifespans of AC units and Furnaces 

  • Air Conditioner or Condensing Unit

You already know that this is the outdoor unit through which air from the outside gets conditioned and pumped in the house. Ideally, a well-maintained AC can last to an upwards of 15 years.

Average Lifespans of AC units and Furnaces 

  • Furnace 

The furnace, on the other hand, lasts a little longer. Furnaces have an average lifespan of 15-30 years. However, this depends on factors such as usability, maintenance, and model.

Replacing HVAC Systems – What to Consider 

Since both AC and furnaces are highly dependent on each other, it is crucial to ensure that they are working efficiently together. This is done by repairing and making sure all parts are working correctly.

Provided that the furnace and the AC have deferring lifespans, it becomes a little challenging to decide if to replace both or one at a time. But here is the kicker, the lifespan of the furnace is almost double that of the AC. This means that you can use one furnace with two AC units.

Therefore, should you replace the furnace and AC at the same time? Yes, if the furnace is twice older than the AC or is completely broken. And no, if the furnace was installed at the same time with the AC or condenser unit.

Final Word

Are you experiencing HVAC or air conditioning problems in your home or office? You have found the right solution to all your heating and air conditioning issues. Our Preferred Services consists of a professional team of local heating air conditioning contractors that will work with you until your air conditioning issue is resolved.

For any Air conditioning service in Palm Springs, Water Heater installations in Palm Desert, and even air conditioning contractors in Indio, reach out to an experienced Indio and Palm Springs plumbing company to help you out. We have a culture we live by where we assure you of no hidden charges, up-front flat-rate pricing, and no overtime charges or surprises.

See our Video transcription from youtube

So you’re in a position of making a decision to replace your air conditioning system,

and the question is do I need to replace my heater at the same time?

In today’s Preferred Pointers we’re going to talk about that.

You’re at that point where you have to make a decision on replacing the air conditioning system,

but the question is do I have to replace my heater at the same time?

Well, the answer is it depends?

First of all, you have three different components to your heating and air conditioning.

You have the outdoor condenser that all familiar unit that you hear and see outside.

You have the cooling coil, which is on top of your furnace.

So again, you have the furnace the cooling coil and your condenser.

So your heater is actually the blower that moves the air throughout the house.

Okay. So as long as there’s nothing wrong with this unit many

times we can just replace the cooling coil

and the condenser outside

because it’s those two components that need to be perfectly

matched to give you the air conditioning you need.

So depending on the age of the overall. Them you may want to take

advantage of replacing your furnace at the same time

because there is an overlap and labor.

We’re already here dealing with the coil and the condenser. A lot of times

it just makes sense to replace the furnace. However,

the main thing really is if you’re having air flow problems throughout the house,

you may just have an undersized system

and the furnace is actually the unit that blows the air throughout the house.

So if this is under sized you’re going to be struggling with air flow throughout the house.

So just may be wise to replace everything all three components of at the same time.

So typically if your furnace is over 10 to 15 years old,

that’s another indicator that you’d want to replace it just

because of the different components that are starting to fail especially your heat exchanger.

Now the good news is in Coachella Valley. We don’t use our heat a whole

lot but we still want to take advantage of looking at that heat exchanger to make sure it’s safe

and no carbon monoxide is floating around the house,

right? But the second part really is the efficiency.

So if you’re looking for higher efficiency and even lower electric bills,

you’re going to want to replace your furnace

as well, because remember we talked about earlier is this

is what actually blows the air throughout the house

and to get the higher efficiency ratings The Seer SEER seasonal energy efficiency ratings.

We have to replace this unit with what’s called variable speed technology.

Now this variable speed technology is kind

of like when you’re driving your car you have a gas pedal

and to ramp up your pressing down on the gas pedal and when you’re getting off the freeway,

you’re letting off the gas pedal and to get the most miles per gallon.

You’re actually holding the gasp. Pedal steady at 55 65 miles an hour,

but you’re not going up and down fast. The variable speed technology will

actually ramp up to meet the demand of the thermostat

and it will hold it in place

for longer periods of time to get you the maximum comfort and the lowest electric bills possible.

And as a bonus, if you’re looking for quiet,

this is the quietest product that you could pick up on the market is this variable speed technology.

Some people don’t even know the systems on at times.

So should I replace my furnace while I replace my air conditioning system?

That’s what we covered here today. Right? The two main points is do we have enough air flow

and do we want maximum efficiency?

Those are really the two reasons why you would want to replace the furnace at the same

time and save a bunch of money.

So if you’re at that point

and needed to make a decision

whether or not to replace your furnace along with the air conditioning system,

I’d love to help my information is right here on the screen.

I’m Rick Cuba with Preferred Air Conditioning Heating

and Plumbing. Until next time on Preferred Pointers.