We have been installing Mitsubishi units since 1982. The product line has proven to be extremely reliable, quiet and efficient. The new outside condensing units you hardly know when they are running.

 

In 2006 the new line of Mitsubishi was introduced into the U.S. which incorporates inverter technology and a refrigerant (R410a) that is considered environmentally friendly. (Mitsubishis inverter technology has proven itself for many years in Europe and Asia).This technology changes the speed of the compressor and the fan motors to balance with the heat load. This is accomplished by the microprocessor within the blower taking samples of the air temperature and finding the heat gain or loss rates and than adjusting to the flow of heat.

 

By controlling the compressor and fan speeds the efficiency of the system is increased greatly. Upon start the Mitsubishi compressor runs at minimum speed and if required will slowly increase to needed output. This operation also decreases power consumption in contrast to a traditional compressor which upon start the motor requires 5 times the power than when running this excess power drain (called Locked Rotor Amps) can be seem when your lights dim upon compressor start.

 

The comfort level is increased greatly over convention heating and cooling systems. This increase is do to the fact that typical A/C and heating systems have what is called system lag and overshoot. System lag is when the room temperature drops below the thermostat set point the system now turns on but it takes some time before the room starts to warm and the temperature may have dropped 2˚ F below thermostat set point. System overshoot is when the room reaches thermostat set point and the unit shuts down, the heat is still traveling from the pipes in a convection (baseboard) system or from the blower in a warm air furnace raising the room temperature above set point. This system lag and overshoot quite often leads to a temperature swing of 4˚ F or more which in turn, you will feel cool during system lag and warm in the overshoot stage.

 

The US Department of Energy mandated that after December 31, 2005 no residential central A/C units may be manufactured with less than a 13 SEER rating.  As of February 2008 the Department of Energy has not established a method  to rate the Inverter controlled Mitsubishi units at reduced capacities, but logically if you reduce the power consumption by 50% the SEER should be greatly increased during reduced operation periods.

 

When a Mitsubishi system has been properly sized and installed most of the running time is at less than 50% of capacity a system. With the system running at 50%, the energy consumed is greatly reduced and the comfort level is increase due to the constant room temperature. All of the single Mitsubishi residential units have a SEER (seasonal energy efficiency ratio) of 15.1 to 26, the duel and triple units up to 18 SEER.