Roof-mounted air conditioners offer the best possible cooling capacity. They typically require split-system features, as they cool through ductwork. Air conditioners mounted through the roof are considered convenient due to the fact that they are out of the way of any outside building or home construction and by being on the roof, the noise level is also much lower. When choosing an air conditioner unit, it's essential to look for efficiency and getting a SEER (Seasonal Energy Efficiency Ratio) model will help you to use the least amount of energy. Size is also a very important factor, as you must get a unit that provides the right amount of BTU for your home. Lastly, consider the ease of installation, as roof-mounted air conditioners typically require some amount of ductwork. According to Consumer Search both Quality Smith and Sears offer the best prices on air conditioner units. They carry a wide selection of top-quality SEER products to choose from. Both companies also offer free heating and cooling estimates.

It's best to compare both products and services through both companies, before choosing which company can offer the best deal for you. A roof-mounted air conditioning system will typically range anywhere between $1,000 to $6,000. The price depends on the amount of BTU offered and efficiency level. The larger the cooling capacity and higher the energy efficiency rates, the more money you will have to pay. However, keep in mind that SEER units will save you money in the long run, as you will save on the cost of high energy bills. Due to the fact that roof-mounted air conditioner units are exposed to direct sunlight, they can overheat, reducing its effectiveness. Therefore, it's best to place them in an area on the roof that gets the most shade and least amount of direct sunlight. Gain 2 pounds per week Gain 1.5 pounds per week Gain 1 pound per week Gain 0.5 pound per week Maintain my current weight Lose 0.5 pound per week Lose 1 pound per week

Lose 1.5 pounds per week Lose 2 pounds per weekPackaged systems are popular in certain regions, where construction techniques favor a single cabinet system rather than a split system, which has both an outdoor and an indoor unit. Regions: Southeast, South and Southwest Typically, packaged units are installed outdoors at ground level, in a crawl space, or they may be installed on the roof for horizontal orAvailable in the same configurations, and utilizing the same components as split systems,  also offer a variety ofUnlike split systems, in a packaged system, most components are in one cabinet. According to your needs, you can select from the many types of packaged systems available: In parts of the country where the weather tends to be warmer, a packaged air conditioner is the perfect solution. units are also available with Comfort-R™ airflow mode, offering better With heating, air conditioning and air-handling functions in one

unit, a packaged heat pump can take care of all your home comfort high-efficiency packaged heat pump comes equipped with two-stage heating and air conditioning for maximum comfort and efficiency.ac unit heater PACKAGED DUAL FUEL (EARTHWISE™ HYBRID)working of air handling unit pdf A packaged dual fuel unit has what you might call a splithow much for 5 ton ac unitAs a heat pump, it cools and dehumidifies your house inDuring the spring and fall, the heatpump providesThen, when the temperature dips well below freezing, it can provide gas heat for greater comfort. where natural gas is not available, you can use propane gas as fuel. A packaged gas electric unit offers you electric air conditioningIn warm weather, it's an all-electric high-efficiency

In cold weather, it provides warmth from natural gas or propane, giving you the best of both energy worlds. high efficiency gas electric packaged unit also comes equipped with two stage heating and air conditioning for morePackaged Rooftop AC Units Rooftop AC units or “RTU’S are configured all in one condensing and evaporator units for roof applications. The picture on the right shows an RTU with side flow supply and return air flow connected to protruding duct work. These are mainly used on commercial buildings but can be used for residential applications as well.  These units are the same type used in mobile homes where central air “split systems” can not be used do to construction restraints. If they are used for residential homes, the FPL rebate program does apply. Efficiencies start at the minimum of 14 SEER and rise from there. To qualify for the FPL rebate the SEER rating must be above 14 SEER. The higher the rating the more rebate increases.

Commercial Rooftop AC Units These type of Air conditioning systems are used strictly for commercial building applications. The duct work is attached  to the bottom of the unit. ( both return air and supply air ) They are set on top of a curb, or curb adapter. These units are normally much larger in capacity than residential package units. The capacity of cooling is measured in tonnage for the particular application square footage. For new installations a heat load calculation is used to determine the proper size. Only trained professionals can properly determine the correct tonnage for the particular building. Many things must be taken in consideration before the size of the system can be made.Rooftop HVAC equipment: this article describes rooftop mounted HVAC systems - rooftop air conditioners, rooftop heat pumps, and rooftop heating equipment. We describe types of roof-mounted HVAC equipment and common inspection points, operating problems, and repair approaches.

At page top is a roof mounted swamp cooler or evaporative cooling system on a private home in Tucson. Rooftop mounted central air conditioning systems may include both the cooling unit (evaporator coil, blower fan, filters) and the compressor/condenser unit in one package. At above right is a complex of roof-mounted AC/heat pump systems on a Christchurch, New Zealand high rise building roof. These units may be a bit crowded as well as blown-on by the building's ventilation system openings at the upper right of the image. At above left is a flat-roof mounted commercial cooling system located in New York. Rooftop mounted central cooling systems may be smaller packaged systems which blow their cool air down directly into the cooled space through an opening in the roof, drawing return air from a nearby location, or the rooftop cooling system may be connected to duct work which in turn blows down into multiple building areas to deliver cool air, drawing return air from one or more centralized returns.

In many commercial installations, the entire area over a suspended ceiling may serve as one giant return plenum through which pass the supply ducts, delivering air to individual supply registers. While the list above describes the common components of a typical residential air conditioning system, other configurations and packaged units are also in increased use in both residential and commercial installations. Alternative HVAC designs may combine all components except for the duct work in a rooftop mounted unit such as the one shown above where it was mounted on a flat roof over offices at a commercial building. The outdoor compressor/condenser unit of split-system air conditioners and heat pumps is also commonly mounted on rooftops, especially flat or low-slope roofs such as the unit shown at left. Installation requirements for rooftop-mounted split system compressors / condenser units include both a service disconnect (circled in our photo) and often additional measures to assure that the unit is properly padded to avoid damage to the roof membrane, and to assure that the unit is properly levelled.

IN our OPINION, where rooftop mounted split system condenser units are exposed to high temperatures system operating efficiency and costs may be affeted. Details are at SPLIT SYSTEM AIR CONDITIONERS & HEAT PUMPS These photographs show what happens when a rooftop packaged-terminal air-conditioning air handler (PTAC) and horizontal runs of air-ducts are installed on a roof surface and when that air duct system is improperly sealed and also is lined with fiberglass insulation. Water ponded on the old, concave sections of air conditioning ducts on the roof of this commercial office space. As water leaked into the duct system it saturated fiberglass duct liner which in turn, had its normal coating of organic dust and debris from the building, risking an indoor mold or pathogen problem for some of the occupants. The cure for these duct leaks was costly: it was determined that it was less costly to completely replace the rooftop ducts with new metal ducts using outside insulation than it would have been to