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In the United States, ductless mini split systems come in either 110V or 220V. The voltage will depend on the model type and manufacturer. Typically 9k btu and 12k btu units are 110V. All 18k btu and greater models require 220V. Difference in installation The voltage will affect how you install the mini split unit. Your house outlet uses 110V and you can draw power directly from your electrical line if your unit is rated for 110V. For 220V, you will need to run an electrical wire from your main panel. The additional electrical line will increase the cost of...

The cost of installing a ductless mini split will depend on where you live and the contractors that are available in your area. Not all contractors are specialized in ductless mini splits so the final cost can vary a lot from one region to another. Furthermore, the local suppliers may affect the cost of material. The total cost is really the sum of two components: (1) materials and (2) labor. 1. Materials: 1.1 Cost of Mini Split Units A 9K BTU ductless mini split (air handler + condenser) will typically cost around $1000. A 12K BTU model will cost approximately $1200. A...

Variable refrigerant flow (VRF) systems, which were introduced in Japan more than 20 years ago, have become popular in many countries, yet they are relatively unknown in the United States. The technology has gradually expanded its market presence, reaching European markets in 1987, and steadily gaining market share throughout the world. In Japan, VRF systems are used in approximately 50% of medium-sized commercial buildings (up to 70,000 ft2 [6500 m2]) and one-third of large commercial buildings (more than 70,000 ft2 [6500 m2]).   See the full ASHRAE report.

Ductless, mini-split-system heat pumps (mini splits) make good retrofit add-ons to houses with "non-ducted" heating systems, such as hydronic (hot water heat), radiant panels, and space heaters (wood, kerosene, propane). They can also be a good choice for room additions where extending or installing distribution ductwork is not feasible, and very efficient new homes that require only a small space conditioning system.  Like standard air-source heat pumps, mini splits have two main components -- an outdoor compressor/condenser and an indoor air-handling unit. A conduit, which houses the power cable, refrigerant tubing, suction tubing, and a condensate drain, links the outdoor...

The efficiency of air conditioners is often rated by the Seasonal Energy Efficiency Ratio (SEER) which is defined by the Air Conditioning, Heating, and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment.[1] A similar standard is the European seasonal energy efficiency ratio (ESEER). The SEER rating of a unit is the cooling output during a typical cooling-season divided by the total electric energy input during the same period. The higher the unit's SEER rating the more energy efficient it is. In the U.S., the SEER is the ratio of cooling...