
The first step in selecting an interior AC unit is to determine the space's cooling needs. This involves calculating the room's square footage and considering the number of occupants.
A general rule of thumb is to choose an AC unit that can cool 400-600 square feet of space. This can help ensure the unit operates efficiently and effectively.
When selecting an interior AC unit, consider the type of installation required. A self-contained unit can be installed in a window, while a through-the-wall unit requires a dedicated opening in the wall.
The unit's noise level is another important factor to consider. Some interior AC units can be quite loud, while others are designed to be much quieter.
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What Are Internal Units?
Internal air conditioning units are a game-changer for those who want to cool their space without disrupting the exterior. They're a type of air conditioning system that's installed entirely within the property.
These units are typically installed high up on the interior wall or concealed within existing fittings as a ducted unit. This makes them a great option for properties with restrictions on exterior installations.
One of the most significant benefits of internal air conditioning units is that they're easy to maintain. This is because everything is kept within your property, eliminating the need for permission from landlords or authorities to access the system.
Here are some key features of internal air conditioning units:
- The room unit/fan coil is retro-fitted high up on the interior wall.
- Alternatively, it can be installed into existing fittings as a concealed, ducted unit.
- Refrigeration pipework runs from the unit, concealed within the walls/ceilings, to the condenser box.
With internal air conditioning units, you can enjoy a fully functioning air conditioning system without breaching any restrictions. They're perfect for residential and light commercial properties, and can be customized to meet your specific needs.
Benefits and Features
Our interior AC units offer a range of benefits that make them a great choice for any property. They are efficient and effective, providing a solution that works regardless of the type of property you live in.
One significant benefit is that they are easy to maintain, thanks to our maintenance programme and the fact that everything is kept within the property. This means you don't have to worry about accessing conventional units that can be a challenge.
With no unsightly or noisy installations on the exterior of a property, our interior AC units don't disrupt your neighbours, giving you peace of mind.
All the Benefits

Our air conditioning systems offer equivalent cooling efficiency to conventional units, without the limitations.
You can stay cool without worrying about skyrocketing electricity bills, thanks to our AAA rating for electrical energy efficiency.
Ductless mini-split air conditioners are built to cool older homes without ductwork, or smaller homes and add-ons where ductwork isn’t practical.
They have higher efficiency ratings than any other type of air conditioner, making them a great option for those looking to save energy.
Internal air conditioning units are easy to maintain, not just because of our maintenance programme, but also because accessing them is straightforward.
Conventional units can be a challenge to maintain, sometimes requiring permission from landlords or other authorities to access them.
Ductless mini-split air conditioners are quiet, with a compressor located outside, making them almost as quiet as an ordinary fan.
Portable air conditioners are even easier to install than window units, and the hose leading out the window does not obstruct your view.
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Personal Comfort
Personal comfort is a top priority when it comes to air conditioning.
Internal air conditioning units offer a huge benefit: they're easy to maintain, and you don't need permission from landlords or other authorities to access them.
With internal units, you can control the temperature and airflow direction to your liking, thanks to features like programmable timers and adjustable airflow direction.
Consider your personal preferences when choosing an air conditioner: do you prefer a more powerful unit to quickly cool down your space, or a smaller one that takes a bit longer to reach the desired temperature?
Ductless mini-split systems are a great option for flexible cooling and heating, and they're as quiet as an ordinary fan.
The right size of air conditioner is crucial to ensure effective cooling and optimal comfort, so consider factors like your RV's size and layout, climate conditions, and insulation.
You can also explore features like air purification systems and remote control operation to enhance your comfort and convenience.
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Installation and Setup
Our installation team is made up of experienced F-Gas registered engineers who conduct installations professionally and discreetly.
You can expect minimal disruption during installation, making it a seamless process for you.
Our team is approved installers for Panasonic and Toshiba, having met their technical and service quality standards.
We'll work with you to find the best residential air conditioning option for your needs, so try our AC Solution Finder to get started.
Types of Internal Units
Internal air conditioning units come in various forms, each with its own unique features and benefits. One type is the ductless mini-split air conditioning system, which consists of an outdoor compressor and an indoor evaporator coil and air handling unit.
These systems are ideal for older homes without ductwork or smaller homes and add-ons where ductwork isn't practical. Some models have higher efficiency ratings than any other type of air conditioner.
Another type of internal unit is the under-bench air conditioner, which is a popular choice for RV owners. These units are installed under the bench or in a storage compartment, making them virtually invisible while providing efficient cooling.
Here are some key features of under-bench air conditioners:
Portable air conditioners are another type of internal unit, which are even easier to install than window units. They have a floor unit that rolls around on casters, allowing you to quickly position or move it.
Ducted
Ducted units are a great option for those who want a seamless look within their property. They hide away the air conditioning system behind a modern and minimalist grill, which can be especially appealing to those who value aesthetics.
The cost of a ducted unit is an additional £1200 per unit. This is a worthwhile investment for those who want a clean and unobtrusive look in their home.
You can choose from either ducted or non-ducted applications with a ducted unit. This flexibility makes them a great option for a variety of situations.
Here are some key features of ducted units:
- Hide away the air conditioning system behind a modern and minimalist grill
- Additional £1200 per unit compared to non-ducted units
- Ducted or non-ducted applications available
Ducted units are often used in conjunction with other types of internal units, such as the Dometic FreshJet 5 Series Mechanical High Efficiency unit. This unit is designed for quiet operation, making it perfect for use in homes or vehicles where noise needs to be minimized.
The Dometic FreshJet 5 Series Mechanical 13.5K unit is another example of a ducted unit that's perfect for use in RVs or vans. With its low profile design and high efficiency, it's a great option for those who need reliable air conditioning on the go.
No external unit needed
Internal air conditioning units are a fantastic solution for those who want to keep their homes cool without disrupting their neighbors. No external unit is needed, making it perfect for properties with restrictions.
One of the biggest advantages of internal air conditioning units is that they don't require planning permission. This is because they have no external elements, as mentioned in Example 3.
They're also incredibly easy to maintain, as you can access everything from within your property. This is a huge benefit, especially for those who live in apartments or have landlords who make it difficult to access external units.
You can even customize your internal air conditioning units to blend in with your property's interior. Our Urban Compact Wall Unit comes in a range of colors and patterns, so you can choose one that matches your home's style.
Here are some key benefits of internal air conditioning units:
- No external unit or planning permission required
- Easy to maintain
- Customizable to blend in with your property's interior
As you can see, internal air conditioning units are a fantastic solution for those who want a hassle-free and stylish way to keep their homes cool.
Window Ac Units
Window AC units are a popular choice for apartments and single rooms in larger homes that lack central air conditioning. They're designed to fit in double- and single-hung windows.
These units are commonly found in apartments that lack central air conditioning. They provide a cooling boost to single rooms in larger homes.
Window AC units are a convenient and cost-effective solution for cooling a single room or apartment.
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Best RV Conditioner
Dometic offers a range of air conditioners designed to meet the specific needs of recreational vehicle owners.
Their under-bench air conditioners are a popular choice for RV owners, providing discreet and space-saving cooling solutions that can be installed under the bench or in a storage compartment.
These units are engineered to operate quietly, creating a peaceful and comfortable environment inside your RV.
They deliver effective cooling performance, maintaining an ideal temperature inside your vehicle even on hot summer days.
Dometic's under-bench air conditioners have a compact design that allows for seamless integration into your RV's interior, without compromising on cooling capacity.
They offer various installation options to accommodate different RV layouts and configurations, ensuring a customized fit.
For those looking for a more seamless look, Dometic also offers ducted units that hide away your air conditioning system behind a modern and minimalist grill, for an extra £1200 per unit.
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SmartStart for Penguin II Condenser
The SmartStart for Penguin II Condenser is a great option for RV owners. It's a soft starter accessory designed specifically for Penguin II electronic air conditioner models.
This accessory makes it easy to start and run your air conditioning unit, and it's a great way to prolong the life of your condenser.
The SmartStart is a simple and efficient solution that helps prevent wear and tear on your condenser, which can lead to costly repairs down the line.
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Choose the Right Conditioner Size
Choosing the right conditioner size for your RV is crucial to ensure effective cooling and optimal comfort during your outdoor travels. Dometic offers a range of RV air conditioners designed to meet the diverse needs of recreational vehicle owners.
The size and layout of your RV play a significant role in determining the appropriate conditioner size. Consider the square footage and specific layout of your RV when selecting the size of the conditioner.
Larger RVs with multiple rooms or compartments require air conditioners with higher cooling capacities. This is because they need to effectively cool the entire space.
Smaller RVs or vans only need a smaller-capacity conditioner to achieve the desired cooling effect. This makes them more energy-efficient and cost-effective.
Components and Parts
The interior AC unit has several key components that work together to keep your home cool and comfortable. The blower motor is a crucial part, making sure the blower is constantly rotating and doing its job.
This motor powers the blower to distribute treated air throughout your home.
Evaporator Coil
The evaporator coil is a crucial component in your HVAC system, responsible for cooling the refrigerant so it can absorb heat and humidity from the air. This process is made possible by the refrigerant, a "working fluid" that plays a vital role in keeping your home cool.
Refrigerant is pumped from the outdoor condenser to the evaporator coil, which lives in the furnace. This coil is designed to cool the refrigerant efficiently.
The evaporator coil pulls heat and humidity from the air by cooling the refrigerant, making it ready to circulate cool air throughout your home. This process is facilitated by the blower, which sends the cooled air back into your home.
Blower
The blower is a crucial component of your HVAC system, and without it, the treated air would have nowhere to go.
The blower produces air movement, which is essential for sending cool air back into your home.
A blower motor powers the blower to distribute treated air throughout your home, making sure it's constantly rotating and doing its job.
The blower works hand-in-hand with the evaporator coil to cool your home, pulling in ambient air and sending cool air back into your space.
Universal Distribution Box (Non-Ducted)
The Universal Distribution Box (Non-Ducted) is a crucial component of your HVAC system, ensuring that air is distributed evenly throughout your home.
It's essentially a central hub that directs air to the right places, much like a damper tells air where to go in your system. Dampers will ensure air is sent to the proper duct, so your home is evenly cooled.
Supply and return vents are also connected to the Universal Distribution Box, bringing air in and out of the system. Return vents bring air in and back to the HVAC system, while supply vents send the treated air back into your home.
This box can be controlled manually, allowing you to adjust the airflow to suit your needs.
Noise Level

Noise can be a significant factor to consider, especially if you value a peaceful and quiet environment inside your RV.
Dometic recognizes the importance of a quiet RV and offers air conditioners equipped with noise reduction technology.
These units operate quietly, ensuring minimal disturbance while you relax, sleep, or enjoy conversations inside your vehicle.
Some air conditioners can be quite loud, making it difficult to have a peaceful time in your RV.
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Who Is It For?
If you're looking to upgrade your home's comfort and energy efficiency, an interior air conditioning unit is a great option. They're ideal for small to medium-sized spaces, such as apartments, condos, or single-story homes.
The interior AC unit is perfect for people who want to cool their living areas without the hassle of outdoor units. This is especially useful for those who live in urban areas with limited outdoor space.
For homeowners who want to save on energy bills, an interior AC unit can be a cost-effective solution. By providing targeted cooling, they reduce the need for whole-house cooling systems.
Approved F-Gas Installers
Our installation team consists of experienced F-Gas registered engineers who conduct installations professionally and discreetly. They're experts in various manufacturers' equipment, including Panasonic and Toshiba.
With expertise in these brands, we're approved installers, having met their technical and service quality standards. This means you can trust that your installation will be done correctly and to a high standard.
Our F-Gas registered engineers ensure minimal disruption during installation, making the process as smooth as possible for you.
Customer Testimonial
Our customers have shared their experiences with us, and we're proud to share them with you. Firdaus, one of our satisfied customers, discussed their new A/C system in a video review.
They were impressed with the system's performance, citing its ability to keep their home cool and comfortable even on the hottest days. Their thoughts on the installation process were also positive, noting that our team was professional and efficient.
Our team's service is what sets us apart from other companies. Firdaus appreciated the attention to detail and the time taken to ensure the installation was done correctly.
Here are some key takeaways from Firdaus's review:
- They were happy with the overall quality of the A/C system.
- The installation process was seamless and stress-free.
- Our team's service was top-notch, with a focus on customer satisfaction.
By hearing from our customers, you can get a better sense of what to expect from our products and services.
RV Size and Layout
The size and layout of your RV is a crucial factor in choosing the right air conditioner. Larger RVs with multiple rooms or compartments may require air conditioners with higher cooling capacities.
Dometic offers a range of RV air conditioners designed to meet the diverse needs of recreational vehicle owners. Consider the square footage of your RV when selecting the size of the air conditioner.
Specifications and Options
The interior ac unit is a great way to cool your home, and understanding its specifications and options is key to making the right choice.
The most common types of interior ac units are window units, through-the-wall units, and portable units.
Window units are a popular choice for small rooms or apartments, and they're relatively easy to install.
They usually come with a SEER rating between 10 and 18, which affects their energy efficiency.
A higher SEER rating means the unit will use less energy to cool the same space.
Through-the-wall units are a good option for rooms with limited window space, and they're often more energy-efficient than window units.
They typically have a higher SEER rating, ranging from 14 to 20.
Portable units are great for temporary cooling or for rooms without a permanent installation.
They usually have a lower SEER rating, ranging from 8 to 12.
It's also worth considering the unit's BTU rating, which affects how much cooling power it provides.
A higher BTU rating means the unit can cool a larger space.
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Frequently Asked Questions
How much is a new indoor AC unit?
The cost of a new indoor AC unit ranges from $150 to $4,500, depending on the type and size of the unit. For a more detailed estimate, consider the type of system you have and the specific needs of your space.
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