A Comprehensive Guide to Install New AC Unit

Installing a new AC unit can be a daunting task, but with the right information, you'll be well on your way to a cool and comfortable home.

The first step is to choose the right AC unit for your needs, considering factors such as the size of your home, insulation, and the number of windows. This will ensure that your new AC unit is properly sized and efficient.

Before starting the installation process, it's essential to turn off the power to the old AC unit at the circuit breaker or fuse box. This will prevent any electrical shocks or accidents during the installation.

The installation process typically involves disconnecting the old AC unit, removing any debris, and preparing the new unit for installation.

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Replacing the old pad with a new one is crucial before installing the new air conditioner. A composite pad is recommended because it can sit outside for as long as the air conditioner's lifetime and absorb vibrations from the unit, reducing noise.

A gravel base should be used to level the area or build it up, while a vibration-absorbing composite pad is preferred over poured concrete that can crack and shift. The area must be stable, as moving or lifting the air conditioner can cause severe damage.

Removing the old refrigerant lines can be a bit tricky, but it's essential to do it correctly. Straps must be removed before taking out the line set, and line sets may be located within ceilings or walls or buried underground.

Calculating heat gain is a crucial step in preparing for a new AC unit, and it's not as simple as just guessing the size you need. A contractor will complete an Air Conditioning Contractors of America Manual J load calculation to get an accurate reading.

This process considers factors such as insulation levels, which can greatly impact how much heat your home gains. Proper insulation can make a big difference in keeping your home cool.

Window types and orientations also play a significant role in calculating heat gain. For example, south-facing windows can let in a lot of sunlight and heat. We recommend avoiding contractors who claim to be able to size your AC system without this calculation, as it's not a reliable method.

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Packaged units are a compact design that combines all components in a single outdoor unit, making them ideal for homes with limited indoor space.

This compact design allows for easier installation, but it might be less efficient than other options.

Packaged units are generally easier to install, which can save time and hassle during the installation process.

However, they might be harder to service than split systems, which could lead to longer repair times if something goes wrong.

Their compact design also means they take up less space, making them a great option for homes with limited outdoor space.

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After the installation is complete, it's essential to check the system to ensure it's working correctly. The blower and compressor should be working effectively, and the air should be blowing through the ductwork.

Both the blower and compressor should be working effectively, and the air should be blowing through the ductwork. This indicates that the system is cooling the air adequately.

Even if the unit appears to be operating correctly, common problems can still arise. Refrigerant leaks, inadequate maintenance, and electronic control failure can all cause issues.

A professional installation or inspection can help prevent these problems and ensure a long-lasting, energy-efficient, and safe home AC unit.

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Removing and replacing parts of your air conditioner requires some preparation and care. A cased evaporator coil is highly recommended as it comes with an insulated cabinet and removable panels, making repairs and modifications easy.

Our technicians will disconnect the metal plenum before installing a new evaporator coil, and if you're using an uncased coil, they'll need to prepare the supply plenum to prevent damage.

The refrigerant line is made up of two copper lines that transport refrigerant to the outside condenser and back into the evaporator coil. It's essential to handle the refrigerant line carefully, as old systems use different oils than new ones, and mixing them can damage the new air conditioner.

Removing and replacing the components of an air conditioner can be a complex process, but understanding the basics can make it more manageable.

Cased evaporator coils are highly recommended due to their insulated cabinet with removable panels, providing easy access to the coils.

A cased coil can be installed directly on the furnace, making repairs and modifications straightforward.

Uncased coils, on the other hand, require preparation work to prevent damage to the furnace or coil.

The supply plenum needs to be prepared before installing a new uncased coil, and a rail may need to be installed to create distance between the furnace and the coil.

Old refrigerant lines can be a challenge to replace, as they often contain different oils that can mix and damage the new air conditioner.

It's essential to flush and clean the old lines, and ensure the line pressure is working properly.

Reusing old lines is not recommended unless absolutely necessary, as it can lead to problems down the line.

Our licensed technicians will install hangers around the area the refrigerator lines pass through to keep them in place.

The lines will be rolled out and pushed close enough to reach the valve of the outside unit.

A small low-voltage control wire will also be installed, connecting the thermostat to the furnace and the outside unit, allowing you to turn the air conditioner on and off with ease.

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Refrigerant line sets are typically made of copper and come in two lines: the suction line and the liquid line. The suction line is larger and usually insulated.

The lines are usually available in lengths of 15 to 50 feet and are rolled into a coil for easier handling. They need to be secured every 4 to 6 feet with plastic or copper strapping.

Installers will take care not to bend, kink, or damage the lines during installation. This is to prevent any potential issues with the system's operation.

The lines are usually run near beams and ductwork, if possible, to make the installation process easier. This also helps to keep the lines organized and out of the way.

A 2” to 2.5” hole is usually drilled in the outside wall near the AC to run the lines through. Just enough line is then pushed out to reach the service valve.

Special care is taken when adding refrigerant to prevent it from coming into contact with the air and getting contaminated.

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Condensate Drain Line

The primary condensate line runs from the evaporator coil to a floor drain or condensate pump. This line allows moisture to flow from your home when the AC is running.

A PVC pipe is used to connect the evaporator coil to the drain or pump, and it's secured and glued to prevent flooding.

The condensate drain line is a crucial part of your HVAC system, and it's often installed by a specialist if the house doesn't have a floor drain.

A condensate pump is installed if the house doesn't have a floor drain, and it's connected to the primary condensate line to direct the moisture away from your home.

A safety overflow switch is connected to the evaporator coil's secondary port and wired to the furnace control, so the system shuts off when tripped, preventing any potential damage.

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If you're looking to replace your air conditioner, working with existing HVAC systems can be a game-changer. Adding a central air system is more straightforward in homes with existing forced-air furnaces.

Technicians can often use existing ductwork, which means less extensive modifications. This can save you money and reduce the disruption to your home.

Old refrigerant lines can be a problem, but they can be reused if necessary. However, it's essential to flush and clean the old lines and ensure the line pressure is working.

Our technicians will install hangers around the area the refrigerator lines pass through to keep them in place. They'll also install a small low-voltage control wire connecting the thermostat to the furnace and the outside unit.

Inspecting existing ductwork is crucial before AC installation. Common issues include leaks, blockages, or inadequate insulation, which can reduce efficiency and performance.

If you're working with an existing furnace, it's essential to ensure the indoor evaporator coil is installed correctly. A cased evaporator coil is preferable, as it has an insulated cabinet with panels that allow access to the coil and sits on top of the furnace.

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Your outdoor AC unit consists of a condenser coil and a compressor, which increases the refrigerant's pressure and temperature to facilitate heat exchange. This is crucial for efficient cooling.

The condenser coil releases the absorbed heat from the refrigerant into the outside air, making it an essential component of your central AC system.

Here's a list of key outdoor components:

On the indoor side, you have the evaporator coil, which absorbs heat from the indoor air, cooling it down before it's circulated throughout the home. The circulating fan moves air through your HVAC system, while the thermostat regulates temperature by controlling the entire system to maintain your desired setting.

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The outdoor unit is a crucial part of your air conditioning system, and its installation is a key step in ensuring it runs efficiently.

The AC condenser is placed on a composite pad and inspected for potential damage. This helps prevent any issues that could arise from a faulty condenser.

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The line set is fitted to the new unit's service valve, which isolates the refrigerant and the outdoor condenser from the indoor coil. This is a clever design that allows for repairs without having to replace the refrigerant.

The copper line set and valves are brazed or welded together to ensure a leak-proof connection. This is a crucial step in preventing refrigerant leaks.

The filter dryer is installed in the condenser, preferably next to the expansion valve, to absorb moisture and provide filtration. This helps keep your air conditioning system running smoothly and prevents any damage from moisture buildup.

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The heart of any central AC system lies in its various components, each playing a crucial role in keeping your home cool and comfortable. The compressor, found in the outdoor unit, is responsible for increasing the refrigerant's pressure and temperature to facilitate heat exchange.

The condenser coil, also located in the outdoor unit, is where the absorbed heat from the refrigerant is released into the outside air. This process is essential for removing heat from your home.

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Ductwork is a vital component of the system, distributing cooled air to different rooms and returning warm air to be cooled again. Proper ductwork is necessary for efficient airflow and consistent cooling.

The evaporator coil, found in the indoor unit, absorbs heat from the indoor air, cooling it down before it's circulated throughout the home. This process is a key part of the cooling cycle.

A circulating fan is also a crucial component, moving air through your HVAC system. This helps to distribute cooled air and remove warm air from the system.

Here's a breakdown of the key components of a central AC system:

If you're dealing with a home without ductwork, don't worry – there are still options for installing central AC.

Ductless mini-split systems are a great alternative. They consist of an outdoor compressor and one or more indoor air handling units, connected by refrigerant lines.

These systems are both efficient and flexible, making them a popular choice.

One type of ductless mini-split system is the high-velocity system. It uses small, flexible tubes to deliver cooled air at high speeds.

High-velocity systems are particularly useful in older homes with limited space for traditional ductwork.

Here are some options to consider:

Choosing and installing a new AC unit requires some careful consideration. You'll want to decide where to install it, start the assembly process, and add refrigerant.

A licensed contractor can help determine the right size AC unit for your home, taking into account factors such as the unit's cooling capacity and the home's heat gain calculation. One ton equals 12,000 BTUs, and the right size depends on this calculation.

You'll also need to decide between a cased or uncased evaporator coil, with cased coils being highly recommended for their ease of repair and modification. A cased coil has an insulated cabinet with removable panels that provide access to the coils.

A central AC unit's performance depends on its size and type, so it's essential to get it right. Proper sizing ensures that your system can handle your home's cooling needs without overworking.

The right size depends on your home's heat gain calculation, which is determined by factors like insulation, windows, and climate. One ton equals 12,000 BTUs, and undersized units will struggle to cool your home, resulting in excessive wear and higher energy costs.

Undersized units will cycle on and off frequently, meaning inefficient operation and reduced comfort. Oversized units, on the other hand, will cool your home too quickly, wasting energy and reducing the system's lifespan.

To determine the appropriate unit size, consider the following:

Keep in mind that these costs don't include ductwork modifications or replacement.

Choosing a thermostat can be a bit overwhelming, but it's a crucial part of the air conditioner installation process.

A new thermostat is usually provided during air conditioner installation, or the installer will check the connection between the existing thermostat and the new system.

If you want a smart system, you can install a separate thermostat that allows you to control the temperature remotely and receive notifications when the system is malfunctioning.

Your AC installer should also demonstrate how to use your new thermostat, so make sure to ask questions and get a thorough explanation.

A cased evaporator coil is preferable for its ease of access and repair. It has an insulated cabinet with removable panels that allow you to get to the coils without much hassle.

Removing a cased coil is a straightforward process, but uncased coils require more preparation and installation work. This includes installing rails to ensure the coil sits above the furnace heat exchanger at the proper distance.

Split AC systems have separate indoor and outdoor units, with the indoor unit containing the evaporator coil and air handler. This setup is popular for its efficiency and customizable installation.

However, split systems may require more space and can be challenging to install in homes without existing ductwork. Our technicians can help you navigate this process and ensure a successful installation.

A split system's indoor unit can be installed with a cased evaporator coil, which sits on top of the furnace. This design makes repairs and modifications easy.

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There are clear benefits to both DIY and professional installation of a new AC unit. Hiring a certified HVAC professional can result in a more efficient and reliable system.

A professionally installed AC system can provide peace of mind, as the job is done correctly and safely. You can also expect a longer lifespan for the system, as it's installed with the right materials and techniques.

However, there are also drawbacks to hiring out the job, including higher upfront costs.

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You can save on installation costs by doing the job yourself, as you won't be paying anyone for their billable hours.

DIY central AC systems can be a viable option, but it's essential to keep in mind the potential drawbacks.

One perk of a DIY AC install is that you can save on installation costs, which can be a significant advantage.

You can install a used AC unit if you find one that's in good operating condition, but keep in mind that it may be less energy efficient than a new model.

It may take longer to complete the job when doing it yourself, but the cost savings can be substantial.

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Having a professionally installed central AC system is a game-changer for your home's comfort and efficiency. Professionally installed central AC systems can be more expensive upfront, but they often come with a warranty that covers repairs and replacements for several years.

Professionally installed central AC systems can last up to 15-20 years, outlasting DIY systems that may need to be replaced every 5-7 years. This can save you money in the long run by reducing the need for frequent repairs and replacements.

A certified HVAC professional can install and maintain your new AC system, ensuring it's working at optimal levels and not wasting energy. This can lead to significant energy savings, which can be especially beneficial for homeowners who live in areas with high utility costs.

A professionally installed central AC system can also improve indoor air quality by removing pollutants and allergens from the air. This is especially important for homes with pets or family members who suffer from allergies.

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Professional installation of an air conditioning system can be a costly affair, with prices ranging from $3,000 to $15,000 or more, depending on the size of the system and the complexity of the installation.

You'll also have to factor in the cost of labor, which can add up quickly, especially if the installer needs to make any modifications to your home's ductwork.

Hiring a professional to install your AC system means you'll have to wait for them to arrive and complete the job, which can take anywhere from a few hours to several days.

There are a few drawbacks to hiring out the AC installation job, including the potential for damage to your home's walls, floors, and ceilings.

You'll also have to deal with the hassle of scheduling and coordinating with the installation team, which can be time-consuming and frustrating.

Professional installers often have to deal with warranty issues and customer complaints, which can be a burden for the homeowner.

Installing a new air conditioning unit can be a bit of a process, but it's essential to do it right to ensure your system operates efficiently and effectively.

The installation process typically involves several steps, each crucial for a successful installation. Site preparation is the first step, where technicians ensure the installation site is safe and ready for work.

Indoor and outdoor units need to be installed in their respective locations, which requires careful planning and execution. This is where things can get a bit tricky, as you'll need to consider factors like space and airflow.

Refrigerant lines and ductwork connection are critical components of the installation process. Workers connect the units using these lines and ductwork to ensure proper airflow and heat exchange.

Electrical connections and testing are also essential steps in the installation process. Technicians make electrical connections and test all system functions to ensure everything is working as it should.

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Here's a breakdown of the typical installation process:

A final inspection is conducted to verify the successful installation before cleaning up the work area. This is your chance to catch any potential issues before they become major problems.

Safety is a top priority when installing a new AC unit, especially when it comes to handling refrigerant. Federal law requires you to have an EPA refrigerant handling certification or hire someone who does to safely remove the old material from your existing unit.

A SEER rating of at least 13 is now the minimum standard for new central ACs, and investing in a high-efficiency unit can provide long-term savings despite the higher initial cost.

Properly sealed ductwork is crucial to ensure cool air doesn't leak out and fresh air doesn't travel underneath your home, which can increase energy costs.

Recovering refrigerant from an old AC unit requires an EPA refrigerant handling certification or hiring a certified professional.

Attempting to remove refrigerant without proper training is extremely dangerous and not recommended for homeowners.

If you purchase a new unit with refrigerant, you may not need to buy more, but an improperly charged unit will require additional refrigerant.

It's essential to have the right training and equipment to safely handle refrigerant, which is a critical component of an AC system.

You must have the proper certification or hire a certified professional to recover refrigerant from your old unit before installing a new one.

DIY central AC systems can be a cost-effective option, but safety should always be the top priority.

Installing a used AC unit can be a risk, as it may malfunction or be less energy efficient than a brand-new model.

Proper installation and maintenance of your AC system are crucial for safe and efficient operation.

Don't attempt to DIY the refrigerant removal process, as it can put you and others at risk of serious injury or even death.

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To ensure your new air conditioner operates efficiently, you'll want to check the SEER rating, which measures the cooling output divided by the energy consumed. A SEER rating of at least 13 is required by federal law, but higher ratings can provide long-term savings.

Proper ductwork is crucial for efficient cooling. Check that the ductwork is sealed, as cool air leaking out can mean higher energy costs. You'll also want to ensure the ductwork isn't sagging or bent, as this can affect the system's performance.

Investing in a high-efficiency unit can provide significant savings, but it's essential to weigh the higher initial cost against the long-term benefits.

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