Mini-Split Ac Units: Effective For 3-Bedroom Apartments?

Mini-split systems are a great option for heating and cooling bedrooms, but can they service a 3-bedroom apartment? Mini-split systems are ductless and utilize the latest heat pump technology to provide heating and cooling for your home. They are a good option for those who want to save money over choosing a traditional air conditioning and heating unit that requires ductwork. However, the cost of installing a mini-split system can vary depending on the size, efficiency rating, and brand.

The first step to choosing the right mini-split setup is to figure out the best size AC for your space. Air conditioners measure their capacity in BTUs or British thermal units, with a standard 1,200-square-foot home requiring about a two-ton mini-split system, or about 24,000 BTUs.

A single mini-split zone typically costs between $2,000 and $7,800 to install, including the outside compressor. If you have a larger space, you may need to install additional zones, which can cost between $700 and $2,300 each.

So, can a mini-split system service a 3-bedroom apartment? The answer is maybe. It depends on the size of the apartment, the number of zones required, and the efficiency rating of the system. It's important to consult with a professional to determine the best mini-split system for your space.

Single-zone ductless mini splits

The coverage of a single-zone ductless mini-split AC system depends on its BTU rating. The greater the BTUs, the greater the coverage. You need approximately 30 to 60 BTUs for every square foot of the area you wish to cover.

• 150 to 250 sq ft = 6,000 BTUs
• 250 to 300 sq ft = 7,000 BTUs
• 300 to 350 sq ft = 8,000 BTUs
• 350 to 400 sq ft = 9,000 BTUs
• 400 to 450 sq ft = 10,000 BTUs
• 450 to 550 sq ft = 12,000 BTUs
• 550 to 700 sq ft = 14,000 BTUs
• 700 to 1,000 sq ft = 18,000 BTUs
• 1,000 to 1,200 sq ft = 21,000 BTUs
• 1,200 to 1,400 sq ft = 23,000 BTUs
• 1,500 sq ft = 24,000 BTUs

MRCOOL DIY 4th Gen Single Zone Mini Splits are a popular choice for small rooms or spaces, offering energy efficiency and easy installation. They come with everything needed for installation and can be set up using basic hand tools.

Energy efficiency

Mini-split systems are a great way to heat or cool your home efficiently. They are ductless systems that consist of two main parts: an indoor air-handling unit and an outdoor compressor or condenser unit. Each indoor air handler has its own fan and evaporator coil and is connected to the outdoor unit by refrigerant lines. Since they have no ducts, mini-splits avoid the energy losses associated with the ductwork of central forced air systems.

• Properly manage run time: Mini-splits operate most efficiently when used consistently. It's best to leave your mini-split running 24/7, as it will use less energy and keep temperatures more consistent. However, if you're going to be away from home for an extended period, turn it off to save energy.
• Optimize settings: Adjust the temperature settings to your desired comfort level. Choose the 'AUTO' fan setting to allow the system to change fan speed based on the weather and your temperature setting.
• Direct airflow: In the summer, direct the airflow of your mini-split upwards, and in the winter, direct it towards the floor. This will help heat and cool your home more effectively.
• Consider outside temperatures: Mini-splits work efficiently in mild weather, but in extreme hot or cold temperatures, they will have to work harder to maintain the indoor temperature. In such cases, it's more efficient to use a secondary heating or cooling source.
• Maintain your mini-split: Regular maintenance is key to keeping your mini-split running efficiently. Clean or replace the air filter and clean the condenser coil about once a month. Ensure proper drainage and keep the area surrounding the unit clear of any potential airflow blockages.
• Get smarter control: Invest in a smart mini-split thermostat, which will read the temperature closer to where you are and communicate that to your mini-split. This will give you more precise temperature control and allow you to monitor and adjust settings from anywhere.
• Ensure proper sizing and placement: Proper sizing and placement of your mini-split are crucial for energy efficiency. A unit that is too small will have to work harder to heat or cool your space, while a unit that is too large will cause short cycling and waste energy. Place the outdoor unit on a concrete slab or stand at least 4 inches above the ground to protect it from sitting in puddles or snow.
• Check home energy efficiency: Seal and insulate your home to prevent warm or cool air from escaping. This includes ensuring sufficient insulation in walls, attics, and basements, as well as properly installing and sealing windows and doors.
• Use windows and blinds to your advantage: In the summer, keep window coverings closed to reduce the amount of radiant heat entering your home. In the winter, open blinds to allow the sun's warmth to naturally heat your home.

By following these tips, you can maximize the energy efficiency of your mini-split system and enjoy a comfortable home while saving energy and money.

Installation

Installing a ductless mini-split system in a 3-bedroom apartment is a feasible option, especially if the apartment lacks ductwork or as a supplement to an existing forced-air system. This type of system is also suitable for high efficiency, low operating costs, and easy installation.

Choose the Right Mini Split System:

Select a ductless mini-split system that suits your space. There are three main types:

• Single-zone ductless mini splits: Designed for one area, such as a bedroom, with a single air handler and condenser unit.
• Dual-zone ductless mini splits: Designed to heat or cool two areas, with two air handlers powered by a single condenser unit.
• Multi-zone ductless mini splits: Designed for separate areas, with a condenser unit accommodating multiple air handlers.

Consider the size of your apartment and choose a mini-split system with the appropriate British Thermal Unit (BTU) output. Measure your space and calculate the square footage to ensure you select a properly sized system.

Install the Indoor Unit:

• Choose an appropriate wall: Select a wall in each room that leads to the outside. Look for a wall with enough space to house the air handler, ensuring it won't be blocked by furniture. The air handler should be installed at least six feet from the floor and away from direct sunlight or other heat sources.
• Locate the studs: Use a stud finder to locate the studs in the wall where you plan to mount the air handler. Ensure there are no wires, pipes, ducts, or other obstructions inside the wall.
• Place the mounting bracket: Mark the mounting holes on the wall and drill pilot holes. If you can't drill into a stud, use hollow drywall anchors to secure the bracket. Ensure the anchors can bear the weight of the unit.
• Drill holes for connections: Drill a hole in the wall for the refrigerant lines, drain tubing, and control lines. This hole is typically 2-3 inches in size and is located based on the mounting bracket, usually in the lower left or right corner.
• Connect the control wire: Follow the manufacturer's instructions to connect the control wire to the indoor unit. This may involve removing a back plate and attaching the wire by hand.
• Feed the pipes and tubing through the wall: Unfold the refrigerant pipe and bundle it with the control wire and drainage tubing using electric tape. Lift the indoor unit to the mount and pass the bundled connections through the hole in the wall.

Install the Outdoor Unit:

• Choose a location for the outdoor unit: The condenser unit can be placed on the ground, rooftop, or exterior wall using special mounting hardware. If placed on the ground, secure it to a pad made of concrete or a purchased pad.
• Connect the pipes and tubing: Once the condenser is mounted, connect the pipes and tubing from the indoor unit to the outdoor unit. Follow model-specific instructions, and be careful not to cut pre-charged lines as this can be dangerous.
• Secure the connections: Attach the wires and tubing to the exterior wall to keep them in place, and use covers for a neater appearance.
• Connect the pipe joint and wiring: Connect the correct pipe joint to the line set on the back of the outdoor unit, and then connect the multi-conductor wiring from the indoor unit. You may need a torque wrench for this step.

Follow Up with a Professional:

While mini-split systems can be installed as a DIY project, it is recommended to consult a professional HVAC technician to ensure proper installation and maximize the performance of your system. A licensed electrician should also be hired to power the unit safely.

Cost

The cost of installing a mini-split system in a three-bedroom apartment will depend on several factors, including the size of the unit, the number of zones, the brand, and the efficiency rating. Here is a breakdown of the costs associated with installing a mini-split system:

Unit Size

The cost of a mini-split system can vary depending on the size of the unit, which is measured in BTUs (British thermal units). The number of BTUs required will depend on the square footage of the apartment and the number of bedrooms. For a three-bedroom apartment, you will likely need a higher BTU capacity, which will increase the cost.

Number of Zones

Mini-split systems can be configured to have multiple zones, which allows for independent temperature control in each room. The cost of adding additional zones will depend on the number of indoor units or "heads" required. Each zone will require its own indoor unit, and the cost of these units can range from $450 to $1,600 each.

Brand

The brand of the mini-split system can also impact the cost. Well-known brands typically have a higher price point, while lesser-known brands may be more affordable. It is important to research different brands and compare prices to find the best option for your budget.

Efficiency Rating

Mini-split systems with higher efficiency ratings, such as those with a higher seasonal energy efficiency ratio (SEER), may have a higher upfront cost but can save money in the long run by reducing energy consumption. It is important to consider the long-term operating costs when deciding on the efficiency rating of the mini-split system.

Installation Costs

In addition to the cost of the mini-split system itself, there are also installation costs to consider. These costs can include labour, materials, and any necessary upgrades or modifications to the existing electrical or structural components. Installation costs can vary depending on the complexity of the installation and the rates charged by the HVAC contractor.

Overall, the cost of installing a mini-split system in a three-bedroom apartment can range from $2,000 to $16,400 or more, depending on the specific requirements and features chosen. It is always recommended to consult with a professional HVAC contractor to obtain an accurate quote for your particular situation.

Maintenance

A ductless mini-split system is a high-efficiency, compact air conditioner that does not require ductwork. Instead, it utilises a small hole in the wall for a conduit to connect to its outdoor component. This type of system is designed to cool a smaller area, such as a single room, rather than an entire house.

While mini-split systems offer many benefits, they do require regular maintenance to ensure optimal performance and longevity. Here are some maintenance tips to keep your ductless mini-split system in top condition:

Cleaning

Mini-split systems need free-flowing air circulation around both the indoor and outdoor components to operate efficiently. Regular filter cleanings are crucial to maintaining your unit. It is recommended to clean or replace the air filters every 4-6 weeks, following the manufacturer's instructions. Additionally, inspect and clean the indoor unit's air filter, cabinet, and coils periodically to prevent dust and dirt buildup. For safety, ensure the power is turned off before cleaning.

Outdoor Unit Maintenance

The outdoor unit also requires periodic maintenance. Remove any accumulated leaves and debris from the base of the cabinet, and trim nearby shrubs to ensure adequate clearance. Check the coils for dirt and debris, and clean them with a garden hose when necessary, ensuring the unit is completely dry before turning it back on.

Professional Inspections

While some maintenance tasks can be performed by homeowners, it is recommended to schedule an annual professional inspection and tune-up with an HVAC technician. They will conduct a comprehensive check of your ductless system, clean or replace air filters, clean the indoor and outdoor coils, and inspect all system components, including mounting hardware, electrical connections, and refrigerant lines.

Signs You May Need Professional Help

• Excessive condensation, ice buildup, or freezing of the coil
• Broken or malfunctioning parts
• Signs of water leakage from or near the indoor unit
• Reduced or no airflow from the indoor unit
• Unusual sounds coming from the indoor or outdoor units

By following these maintenance guidelines, you can ensure your ductless mini-split system operates efficiently and effectively, providing comfort and longevity while potentially saving you from costly repairs.

Frequently asked questions