Basics of Ductless Heat Pumps

By November 11, 2020 January 6th, 2021 No Comments

If you are a contractor and considering getting more into ductless heat pumps in your business, this first blog post offers a simple story about ductless heat pumps. From this, you can extract several proven value propositions about ductless heat pumps. It also contains a simple selling story you can use to get others interested in ductless heat pumps. Don’t worry that it is “light-duty”. That is my intention. We will get more into the details and talk tech in the following 51 weeks.

Ductless heat pumps are a relatively new technology for consumers in the US. However, homeowners around the world have made it the #1 heating and cooling system. Interest in the USA is growing rapidly.

Ductless heat pumps use inverter technology, which makes a ductless heat pump incredibly energy efficient and able to produce superior comfort.  Inverter technology uses computer control of the heat pump to match the heating or cooling needs of the space.  This is fundamentally different from the typical furnace or traditional AC unit that uses a thermostatic switch to flip the system on and off. A ductless heat pump’s inverter slowly ramps up to satisfy the thermal needs of the space. Once the setpoint is reached, the inverter controls ramp down the system to maintain the set temperature. The Inverter controls are able to adjust to changing weather conditions and continue to produce low-cost heating and cooling even at extreme temperatures experienced around the USA.


A ductless heat pump is a split system connecting an outdoor unit with an indoor unit. Components are connected using copper refrigeration lines and an inter-unit connecting wire. The outdoor unit can be placed on level ground on a ground pad or can be mounted on the side of a structure with brackets. The indoor unit is mounted inside the home on a wall. There is a small 2 ½ inch diameter hole that is drilled through the wall to connect the indoor unit to the outdoor unit by insulated copper lineset.


Ideally, for contractors, installation can be very simple. This allows the contracting business to get the most from scarce labor resources. When properly sold, a single zone ductless installation can be performed by one installer in a half-day. Multi-zone systems are also available, with up to 8 indoor units connected to one outdoor unit. However, multi-zone systems take longer to install and may not always be the best solution. According to successful ductless contractors, selecting the right product for the installation is an important decision.


To learn more great ideas about successful ductless contracting, check out membership in Growing Ductless. See