If you can't run duct work, a ductless AC can keep you cool

Ductless ACs work where full size units don't

TAMPA - Ductless air conditioners cool individual rooms without having to cool the entire house. For situations where you may not have ductwork or if running duct work is very difficult these are ideal systems. They are often used to replace window air conditioners and can be found in home additions and to improve comfort in poorly cooled rooms.

"Most often you'll find people using ductless air conditioners in a sunroom, garage area, even an attic – anywhere you don't have your central duct system running to," said Angie's List founder, Angie Hicks.

Similar to a central air-conditioning unit, a ductless system has a split design, but it doesn't use the duct work in your home. An evaporator is installed in the home, and the condenser is placed outside. Tubes filled with refrigerant run from the outside unit to the inside unit. A unit can cool a single room, and up to four units can be used with a single condenser. The homeowner can control the temperature independently in each room the air handler is installed.

A single-zone system has one condenser and one evaporator and is used to cool one room or area. For large areas or multiple rooms, you will need a multiple-zone split system. This allows you to use up to four indoor units from only one condenser. In a multiple-zone system, each unit can be set to a different temperature and each unit runs independently. If you want to cool your entire home with this type of cooling, it's best to have a unit for each room. Unlike with central A/C, you can set the temperature at different settings for each room to save energy.

Installing a ductless system is not as complicated as a central A/C system, but it's more involved than installing a window or wall unit. An HVAC professional will need to run lines for coolant, electricity, and drainage. The unit must also be charged with the correct amount of refrigerant. Because it's wall-mounted, you don't have to sacrifice a window to be cool.

These systems cost about $1,500 to $2,000 per ton of cooling capacity – which is about 30 percent more than central systems and may cost twice as much as window units of similar capacity. There are benefits in energy efficiency, though. Since they have no ducts, you don't have the energy loss associated with the ductwork of a central forced air system. According to industry experts, duct losses account for about 20% of energy consumption.

Not all HVAC contractors are experienced and knowledgeable with ductless air conditioning systems. Before hiring, ask how long they have been installing the systems and what type of training employees receive about installation and service. Improper installation can lead to system malfunctions and future repair costs. Get three written estimates. Costs vary widely from one company to the next, but it's also very important to ensure that the project's overall scope, details and completion dates are thoroughly documented.

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