Heat Pumps (Ducted)
We currently offer Carrier heat pumps for ducted systems, Daikin mini-splits for single room flexibility, and Mitsubishi combination systems (mini-split wall units and small ducted units) for multiple zones. In our experience, these brands are the most robust in terms of dealing with Vineyard voltage issues while providing flexibility and efficiency in heating and cooling your home. It is important to determine what your winter comfort goals are – older heat pump systems were designed to work well until the outside air temperature dropped into the 30s; today’s modern heat pumps keep working well down into the single digits. This means that the annual cost of heating a home with an air source heat pump has dropped considerably.
For larger rooms or homes that use ductwork to distribute heated and cooled air, we offer the Carrier Greenspeed air source heat pump as the top-of-the-line option. It is arguably as efficient as geothermal systems at half the cost. Its annual operating cost is half that of a similar propane fired furnace. It is designed and made in the U.S.A. and is truly remarkable:
How they work:
Air source heat pumps use the solar energy in the air to provide heating inside your home.
In the winter, the air source heat pump is able to extract this energy and use it to heat refrigerant up to 180 F. The heat pump sends this heated refrigerant into your home through small copper pipes (called the “line set”) to an inside unit – either a wall mounted “mini-split” or a ducted fan coil (air handler) or a mini-ducted fan coil. The inside unit has a fan or blower in it which uses the heated refrigerant to heat the air in the room. Then the cooler refrigerant is sent back outside to the air source heat pump to repeat the cycle.
In the summer, the refrigerant flow is reversed and the heat from the room is absorbed by the refrigerant and sent outside via the copper pipes. The outside heat pump then rejects this heat to the outside air.
Because these units use outside air and free solar energy as their source of heat, they do not need to connect to the heat in the Earth; therefore there is no expensive geothermal loop to install. These heat pumps are an excellent match with solar electric PV panels – they are an essential part of reducing the carbon footprint of your home towards net-zero.
Because these units use outside air, they will frost up in the winter during normal operation. This means that periodically the system will stop heating the air inside so that it can defrost the heat pump outside. Additionally, these heat pumps will have reduced heating capacity as the outside air gets colder. This means that sizing of the air source heat pump for the heating load on the coldest day of the year is very important. Finally, because the outside heat pump depends on a fan to pull outside air through the heat pump, it is critical to keep the heat pump elevated above the snow, usually on a stand.
Heat pumps are not new! Article from 1948 describing air source heat pumps:
Holladay 1948 Heat Pump
Our goal is to be Martha’s Vineyard’s premier plumbing and HVAC shop – we appreciate the opportunity to service, install, and rescue your ducted heat pump system!