What should an AC unit sit on?

Author: Prof. June Gusikowski DVM  |  Last update: Tuesday, June 16, 2026

Without an air conditioner pad to keep pests, muck, and ground moisture away from it, your condenser unit may succumb to the exposure. Keep your air conditioning unit safe by integrating an air conditioner pad underneath. It will help increase the reliability and lengthen the lifespan of most air conditioners.

What is the best base for an AC unit?

Plastic HVAC mounting pads have become the preferred choice for modern HVAC installations for several compelling reasons. Firstly, their lightweight nature simplifies the installation process, reducing the need for heavy machinery and specialized equipment.

Should my AC unit be on a concrete slab?

Refrigerant needs to flow through the coils evenly without too much interference from the slope of the unit. A level concrete slab with rubber pads between the unit and the concrete is what the manufacturers recommend. ``Mostly level'' is probably okay for a residential unit.

What can I put under my AC unit?

Concrete Condenser Pads are built for strength. Typically, these are installed where there's a big air conditioning system, as its strong enough to bear heavy weight. Some choose to also include patio stones beneath the air conditioner unit, but they must be installed and levelled properly.

What should I put my AC unit on?

It's generally recommended to run a window air conditioner at a temperature that provides comfort while maintaining energy efficiency. A common recommendation is to set the thermostat to around 78°F (25-26°C) when you're at home and active. This balance helps save energy while keeping the indoor environment cool.

You're wasting money on heating! Use your A/C!

What should you keep your AC set on?

According to the Department of Energy1, 78° Fahrenheit is the sweet spot for air conditioners to balance energy savings and comfort when people are at home and need cooling.

Is 72 too cold for AC in summer?

Since 72 degrees is generally agreed upon to be an ideal indoor temperature, most people would probably still feel comfortable setting their AC units slightly higher than this, perhaps at around 75.

Should an AC unit be off the ground?

Better Air Circulation

Raising the condenser off the ground allows cool air to flow through the fins along the sides. This helps keep the condenser coils cool and channel the heat through the upper fan. This is extremely important for the proper function of the unit.

Does an AC condenser need to be on a pad?

Are AC Condenser Pads Necessary? Yes. They are the first line of defense against pollutants, pests, muck, and surface damage. Remember, minor issues can snowball into larger ones, warranting costly repairs.

Should I put a tarp over my air conditioner?

Air Conditioner Covers aren't necessary for mild climates, but are still useful to keep out stray leaves, dirt, rocks, grass, and other debris. The key reason to cover your air conditioner is to keep it efficient.

What should my AC unit sit on?

A condenser pad is simply a flat, rectangular slab, usually made of concrete, for the AC unit to be placed on. This stable pad keeps the unit elevated and safe from corrosion and water damage while also making sure it remains level.

Should AC unit be elevated?

An unlevel unit can lead to many problems, from compressor damage to water drainage issues, which can result in costly repairs or even the need for premature system replacement.

Should I put rocks around my AC unit?

Use Rock Landscaping Around the AC Unit

Create a gravel bed around the unit to keep the area dry and free of weeds. Use decorative stones or pebbles to enhance the aesthetic appeal.

Should an AC condenser be on a concrete pad?

Pouring a slab for my heating and cooling system's condenser unit, on the other hand, was not optional. Your condenser unit needs to sit on a stable, level surface for optimal efficiency!

Where should I put my AC unit in my house?

If possible, it is best practice to install your air conditioner on the north or east side of your home. This will ensure that the unit stays out of sunlight during the hottest parts of the day. Keeping your unit in the shade is essential for energy and cooling efficiency.

What is the most expensive part in an HVAC unit?

Usually, it is a quick fix, but sometimes the failure can be caused by a much bigger problem. The most expensive part of an AC unit to replace and repair is the air compressor.

What should I put under my air conditioner?

While you may not think about this as essential to your AC's performance, if you are considering installing a new air conditioning system, it is essential to make sure there is a strong, level, concrete slab in place before putting in the outdoor unit.

Do AC units need to be on concrete?

The most recommended way to keep your air conditioner off the ground is to place it on a concrete pad. If an HVAC professional installs your AC unit, this is likely the remedy they will recommend.

Does the outdoor unit need to be installed on a concrete slab or on brackets?

An outdoor unit does not have to be installed on a concrete slab or brackets. There are many different options for installing your outdoor unit, which are best discussed with your Daikin Specialist Dealer during an on-site consultation to find the most suitable arrangement for your home.

Where should you not install an AC unit outside?

Keep it away from trees and dirty areas

Although shading is necessary, placing it near trees or driveway can attract leaves and dirt inside the unit. Water is a big no no as well so if there is an area where rain tends to pool, mount the unit in a elevated position.

How long does an AC unit need to sit upright?

If on its side or back for more than a day, leave it in an upright position and unplugged for 24 hours.

Why are air conditioners placed high on walls and not on the ground?

Because cool air is denser than hot air so this cool air shifts downward, so the Air conditioner is installed at a height. Warmer air at the bottom is replaced and because it is less dense, it rises. This procedure continues and sets up a convection current that will permit the thermal transfer to occur.

How cool should my house be if it's 100 outside?

For many of us, 70 degrees is the ideal indoor temperature, but when it is close to 100 degrees outside, your AC unit will be working quite hard to meet these expectations. Consider setting your thermostat at 75 degrees to 80 degrees in your home if the outside temperature is approaching triple digits.

Why is my AC set to 74 but reads 78?

If the temperature is set to 74°F but the thermometer shows 78°F, you will have to recalibrate the thermostat to account for this 4-degree deviation. Even with older AC units or furnaces, you might have to recalibrate your thermostat from time to time.

What should I set my AC to on a hot day?

Summer Air Conditioner Settings

In the summer, experts say the thermostat for your air conditioner should be set to at least 78°F during the day when people are at home.

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