A ductless mini-split is a standalone unit that operates independently from other heating systems. This type of heating system is typically chosen to supplement a larger, whole-house system when zoned temperature control is desired. It’s a popular option for new construction when rooms are added and ductwork doesn’t exist or when ductwork is cost-prohibitive to add. Mini-splits are also chosen to heat spaces when the existing HVAC system is not adequately doing the job.
Like traditional heat pumps, ductless mini splits work by transferring ambient heat from outdoors to indoors. Because they function similarly to traditional heat pumps, they leave many homeowners wondering if they are an appropriate choice for colder climates here in the Northeast. In our region, traditional whole-house, ducted heat pump systems are generally considered to be effective down to around freezing (32◦F), after which most systems are programmed to switch to a secondary heat source such as an oil-fired furnace. Ductless mini-splits, however, are smaller systems that do not use ducting and, therefore, experience less heat loss. Instead of heating the entire home, mini splits are focused on a single space, and their design, available technology, and overall performance are much more efficient at lower temperatures. In fact, some models are rated for outdoor temperatures as low as -15◦F.
New ductless mini split heat pumps, however, are changing the rules, opinions and energy bills with sophisticated builds that can provide heating when temperatures dip down below zero. But, the mini split must be installed correctly to achieve maximum performance.
Tighten up your home: Reducing the heating load helps lower bills and boost comfort no matter the heating system you are using. With heat pumps, tightening up the home by sealing air leaks and adding insulation is especially important.
Get the right size system: One of the reasons ductless mini splits offer great efficiency is that they are sized specifically for the zone they are installed. Make sure your certified ductless system contractor uses industry best practices for load calculations and ductless system sizing and selection.
Installing the outdoor unit: Protect the outdoor unit from ice and snow accumulation. The outdoor cabinets may be mounted to the exterior wall well clear of the ground. An overhang or other protective structure may be required.
Installing the indoor unit: Ductless mini splits often offer airflow enhancements for the indoor air-handling unit (AHU) to help circulate heated air evenly and efficiently through the zone. The AHU may be mounted on a smooth surface, such as a wall or ceiling. However, a floor-mounted AHU may offer better heating airflow.
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