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Do You Need Two AC Units in Your Home?

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Have you ever experienced the unusual summer swelter in your home and been frustrated by insufficient cooling power?

Get some help to decide what is suitable for your home today!

Don’t let a hot climate get the better of you – instead, assess if one or two air conditioners will make those scorching months much more comfortable.


Here are the most important factors when deciding whether to get multiple AC units:

  • Size of Living Space
  • Efficient Cooling and Energy Savings
  • Upfront and Maintenance Cost
  • Reliance and Redundancy

Do You Need 2 AC Units in Your Home?

There’s nothing more important than having a functioning air conditioner (AC) unit. But have you ever thought about whether one AC is enough for your home?

Depending on the size of your home and the climate you live in, two AC units could be necessary.

Read on if you’re wondering about investing in a second AC unit!

Size of Living Space

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The first factor to consider is the size of your living space. Generally speaking, homes with many rooms will require more than one unit to cool all the areas of the house properly.

Many experts suggest using 20 BTUs (British Thermal Units) per square foot and calculating the number of BTUs based on how large your residence is.

Doing this basic math can be a great starting point when determining how much cooling power you need.

If your house has multiple floors and different levels of exposed surfaces – like windows, walls, and ceilings – then you might want to install one AC unit on each level of your home for optimal cooling efficiency.

This way, you don’t have warm air leaking in from one floor to another, reducing your house’s overall comfort level.

On the other hand, if your home is smaller and features just one floor or open living area, then one air conditioner could suffice.

Efficient Cooling and Energy Savings

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A powerful air conditioning unit can quickly and efficiently cool an entire area. If you are always looking to cool an entire area at once, a single powerful unit may be more suitable for you.

A single unit allows you to set and maintain the temperature throughout your home compared to several different individual temperature settings for different rooms or areas.

This would also mean that parts of your home will remain cool even when not in use, leading to less efficiency in the overall system.

Multiple air conditioning units might be a great way to save energy, especially when alone. Multiple units allow you to adjust the temperature in different rooms or areas, making it easy to cool only those that need it.

This can help reduce your energy bills, as it will require less energy to cool down multiple rooms than one big room.

Additionally, by having multiple units, you can ensure that you are cooling only those parts of the house that need it and not wasting electricity cooling empty areas.

The overall result is lower energy costs and greater efficiency.

Upfront and Maintenance Cost

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Investing in multiple AC units is more expensive than buying just a single AC unit. This can be due to the cost of the individual AC units and the installation and wiring process.

Consider how many rooms you need the unit in and if they are accessible or hard-to-reach spaces, as that could affect the total price too.

Alongside the initial higher cost for more AC units, there is often more maintenance for regular upkeep over time.

With multiple ACs, if there’s an issue with one of them, you only need to fix that particular unit instead of all of them at once.

However, if you buy only one unit, any issues would need to be resolved on the entire system – making it more costly and time-consuming.

Having a single, more powerful AC unit is incredibly efficient for maintenance.

Rather than having two smaller units, you only need one – meaning only one unit needs regular servicing and filter changes.

This will save you time and money in the long run, as fewer units need inspections.

Reliance and Redundancy

Two Ac Compressor Installed Outside The Home

A single air conditioning unit for an entire home can be incredibly inconvenient. When one component of the system fails, it can cause the entire system to stop functioning, leaving all rooms unable to regulate temperature and creating uncomfortable conditions throughout the house.

When it comes to ensuring reliable, consistent cooling in your home, multiple AC units might have the upper hand here.

Multiple AC units provide redundancy – if one unit fails, the other can continue running until you have time to repair or replace it.

This ensures you don’t experience significant discomfort or disruption due to unexpected AC breakdowns.


Investing in one or multiple air conditioning units for your home depends on several factors.

Think about the size of your home, the layout of your property, and how many rooms you need to cool.

Consider the upfront cost and maintenance requirements plus the efficiency and reliability of each option before making a decision.

You can find the right air conditioning solution with careful consideration and research.

The right air conditioning solution should save you money and provide comfort while keeping energy costs as low as possible.

Remember to ask your local HVAC contractor for their opinion.

They can help you decide which option will be the best for your home. ​ ​Good luck!

Frequently Asked Questions

What Are the Benefits of Multiple AC Units in My Home?

Multiple AC units can help you adjust the temperature in different rooms or areas, making it easy to cool only those that need it. This can save energy and reduce your energy bills.

Additionally, multiple units provide redundancy – if one unit fails, the other can continue running until it’s fixed.

What Should I Consider Before Investing in Multiple AC Units?

Before investing in multiple units, consider the size of your home, the layout of your property, and how many rooms you need to cool. Before deciding, consider each option’s upfront cost, maintenance requirements, efficiency, and reliability.

Who Should I Ask for Advice on My Home’s Best Air Conditioning Solution?

Your local HVAC Contractor can provide expert advice to help you decide which air conditioning solution is right for your needs.

They can help you determine the best option to save money and provide comfort in your home while keeping energy costs as low as possible.

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