What size mini-split do I need for a bonus room?

What size mini split do you need for a bonus room?

Are you looking to install a mini-split cooling and heating system in your bonus room? Mini-splits are appealing for multiple reasons. These systems save energy, are quieter, and require less cleaning than traditional central units. Coastal Home Services provides various heating and cooling solutions. Whether you are looking for a new system for a singular room or your entire house, we have the answers for you. Before purchasing a mini-split unit, it is essential to know the difference between it and a traditional unit. Read on below to learn if a mini-split is the best option for your bonus room.

What is a mini-spit system?

A mini-split is a ductless cooling and heating unit that relies on heated coils to stabilize the temperature. It has one outdoor unit and one or more indoor units. Unlike a traditional AC system, mini-splits require small units in each room instead of air ducts. These units are small and relatively simple to install. Most people choose HVAC units to regulate their home’s temperature but will add on a mini-split for separated rooms. Some bonus rooms are not easily attached to the rest of the house. They include a separate staircase and often come unfinished. Many splits are also appealing because they allow separate temperature-controlled from each room. 

Best mini-split for a bonus room

Mini-split sizing depends on the size of the room and the age of the house. If you purchase a too-small unit for the room, you will spend too much money on your electric bill. On the other hand, a system too large will cost more money, and the system could fail earlier. A single unit mini-split with installation fees averages in cost around $5,000. The more units you buy, the most expensive it will be. Larger areas also require a unit that produces more BTUs. This system will be cheaper and more efficient than installing ducts into a bonus room located over the garage.

Other places to install mini-splits

In addition to bonus rooms, mini-splits make excellent cooling and heating solutions for garages and basements without ducts. Any single room that does not have wiring for vents already preinstalled will benefit from a mini-split. We recommend these systems for areas that you often use but not all the time. If your bonus room is used as a guest room, a mini-split is excellent because you can turn the system off while guests aren’t over, saving you more money. 

Understanding BTUs and Room Size

BTUs (British Thermal Units) are the standard measurement for the amount of energy required to heat or cool a room. The size of the mini-split system you need largely depends on the BTU rating, which correlates with the size of your bonus room. To calculate the appropriate BTU size for your mini-split, consider the following guidelines:

  1. Room Dimensions: Measure the length and width of your bonus room. Multiply these figures to get the total square footage. As a general rule, you need about 20 BTUs per square foot of living space. For example, a 300-square-foot room would require approximately 6,000 BTUs.
  2. Ceiling Height: If your bonus room has a ceiling height greater than the standard 8 feet, you will need to adjust your BTU requirements. For every foot above 8 feet, add an additional 10% to the BTU output.
  3. Insulation Quality: The quality of insulation in your bonus room can significantly impact heating and cooling efficiency. Well-insulated rooms retain temperature better and may require a smaller unit, while poorly insulated spaces may need a larger system to compensate for heat loss or gain.
  4. Sun Exposure: Rooms that receive direct sunlight for most of the day will heat up more quickly, necessitating a higher BTU rating. Conversely, a room that is shaded for the majority of the day may require less capacity.
  5. Occupancy: Consider how many people typically use the bonus room. More occupants generate additional heat, meaning a larger mini-split might be necessary. As a rule of thumb, add about 600 BTUs for each additional person beyond two who regularly occupy the space.

Zoning Considerations

One of the most significant benefits of mini-split systems is their ability to create separate zones for heating and cooling. If your bonus room is used for various purposes—such as a home office, guest room, or recreational area—you may want to consider multiple mini-splits or a larger multi-zone system. This allows you to maintain different temperatures based on the activities taking place in each area.

Zoning not only improves comfort but can also lead to energy savings. For example, if the bonus room is not in use during certain hours, you can adjust the temperature or turn off the unit altogether. A multi-zone system can manage the temperature for different areas in your home independently, allowing for greater flexibility and efficiency.

Placement of Indoor Units

The location of the indoor mini-split unit is just as critical as sizing. Proper placement can ensure even temperature distribution and maximize efficiency. Here are some tips for installing the indoor unit:

  • Wall Height: Install the indoor unit at least 7-8 feet above the floor to promote proper air circulation. This allows warm air to rise and cool air to flow downward.
  • Avoid Obstructions: Ensure the unit is not blocked by furniture or decorations that could obstruct airflow. Keeping the area around the unit clear will help maintain efficient performance.
  • Proximity to Outdoor Unit: The indoor and outdoor units should be within a reasonable distance of each other to ensure effective communication and efficiency.

Maintenance and Longevity

Regular maintenance is vital for ensuring your mini-split system operates at peak efficiency. Unlike traditional HVAC systems, mini-splits require less extensive maintenance, but there are still some essential tasks you should perform:

  • Filter Cleaning: Check and clean the air filters every month. Dirty filters can restrict airflow and reduce efficiency, leading to higher energy costs and potentially damaging the unit.
  • Coil Cleaning: Periodically inspect and clean the evaporator and condenser coils to ensure they remain free of dirt and debris. This helps the system operate efficiently and prolongs its lifespan.
  • Professional Servicing: Schedule annual maintenance checks with a certified HVAC technician. They can inspect the refrigerant levels, clean the internal components, and make any necessary repairs to keep your system running smoothly.

Cost Considerations

When budgeting for a mini-split system, it’s essential to consider the initial investment and long-term operational costs. While the upfront cost for a mini-split system, including installation, can range from $2,000 to $5,000 depending on size and brand, the energy efficiency of these systems often leads to lower utility bills in the long run.

Investing in a high-quality mini-split can pay off over time through energy savings, especially if you select a model with a high SEER (Seasonal Energy Efficiency Ratio) rating. Generally, the higher the SEER rating, the more energy-efficient the unit.

Conclusion

Determining the right size mini-split for your bonus room involves a comprehensive assessment of multiple factors, including room size, insulation, sun exposure, and occupancy. Additionally, consider zoning capabilities, unit placement, and regular maintenance to optimize the system’s performance. While the initial cost may seem significant, the long-term savings and comfort a mini-split system provides can make it a worthwhile investment for your home. If you have any questions or would like professional assistance in selecting and installing a mini-split system, don’t hesitate to reach out to Coastal Home Services. Our team of experts is here to help you create a comfortable living environment in your bonus room!

Coastal Home mini-split system installation services 

At Coastal Home Services, we pride ourselves on offering premium cooling and heating services for our neighbors on the crystal coast. Don’t let your bonus room go unheated or without air conditioning. A mini-split provides energy-saving technology that will transform your stuffy room into a comfortable space to enjoy with friends and family. If you have questions or do not know if a mini-split is the best option for you, contact us today and one of our NATE certified HVAC technicians will help you find a solution that will provide you with the air conditioning solution you need at a great price. Give us a call or fill out the online contact form below. One of our friendly team members will be more than happy to assist you. 

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