do mini splits have backup heat ?

Do Mini Splits Have Backup Heat? – A Comprehensive Guide

Do Mini Splits Have Backup Heat? – A Comprehensive Guide


Mini splits are becoming increasingly popular as a heating and cooling solution for homes and businesses. They are energy-efficient, easy to install, and offer zoned heating and cooling. However, one question that often comes up is whether mini splits have backup heat. In this article, we will explore this topic in detail and provide you with all the information you need to know.

What are Mini Splits?

Mini splits, also known as ductless mini splits, are heating and cooling systems that do not require ductwork. They consist of an outdoor unit and one or more indoor units that are mounted on the wall or ceiling. The indoor units are connected to the outdoor unit by a conduit that contains the refrigerant lines, power cables, and a condensate drain.

How Do Mini Splits Work?

Mini splits work by transferring heat from the outdoor unit to the indoor units. In cooling mode, the refrigerant absorbs heat from the indoor air and releases it outside. In heating mode, the process is reversed, and the refrigerant absorbs heat from the outdoor air and releases it inside. This is possible because even at low temperatures, there is still heat energy in the air that can be extracted and used for heating.

Do Mini Splits Have Backup Heat?

Most mini splits do not have backup heat, but some models do. Backup heat is a secondary heating source that kicks in when the primary heating source is not sufficient to maintain the desired temperature. It is usually in the form of electric resistance heating or a gas furnace. The need for backup heat depends on the climate and the size of the space being heated.

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When Do You Need Backup Heat?

If you live in a cold climate where temperatures regularly drop below freezing, you may need backup heat to supplement your mini split. This is because mini splits become less efficient at low temperatures and may not be able to keep up with the heating demand. Additionally, if you have a large space that requires a lot of heating, a mini split may not be able to provide enough heat on its own.

What Are the Options for Backup Heat?

If you need backup heat, there are several options available:

  • Electric resistance heating – This is the most common form of backup heat for mini splits. It involves installing electric heaters in the indoor units that can be turned on when needed. However, electric resistance heating is expensive to operate and not very energy-efficient.
  • Gas furnace – If you have access to natural gas or propane, you can install a gas furnace as backup heat. Gas furnaces are more energy-efficient than electric resistance heating and can provide heat quickly.
  • Hydronic heating – This involves installing a hot water coil in the indoor units that is connected to a boiler. The boiler can be fueled by gas, oil, or electricity. Hydronic heating is more energy-efficient than electric resistance heating and can provide a more comfortable heat.


Mini splits are a great heating and cooling solution for many homes and businesses. However, if you live in a cold climate or have a large space that requires a lot of heating, you may need backup heat. Electric resistance heating, gas furnaces, and hydronic heating are all options for backup heat. It is important to choose the right option for your needs and budget.

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1.Backup Heat Source for Minisplit System – GreenBuildingAdvisor

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2.How to Choose Backup Heat for a Ductless Minisplit System

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3.FAQ Ductless Mini-Splits | Residential Commercial Heating Cooling …

  • Descriptions: Q: Do ductless units require auxiliary heat? Unlike a conventional heat pump system, our ductless units do not have auxiliary heaters. The standard ductless …
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4.FAQs About Ductless Mini Splits & Heat Pumps, Central Air, Solar …

  • Descriptions: A ductless mini-split system could rely on any previously existing heat source as the backup. The heat pumps are the primary heat sources; the backups would …
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5.Ductless Heat Pumps: Auxiliary vs. Emergency Heat

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6.The Definitive Guide to Mini-Split Heat Pumps – Daikin Atlantic

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  • Website : split heat pump with electric back up suggestions. – HVAC-Talk

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8.Ductless Cooling and Heating: How Does a Mini-Split Work?

  • Descriptions: You will need a proper backup heating source, such as your furnace or boiler, when temperatures dip below 30 degrees Fahrenheit. With that being said, mini- …
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9.Do I need a backup heat source for my heat pump?

  • Descriptions: For mini-split heat pumps installed in homes without ductwork, electric baseboards or high quality electric fireplaces are a viable back-up option. Natural gas …
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