Goodman furnace

How to Buy a Central Split Complete System

In Heating & Cooling 101, Most Popular, New Products by YounitsLeave a Comment

Purchasing a complete HVAC system can be a daunting task.  As part of our core mission, believes that the process should be simple and accessible to contractors and homeowners alike.  We have made the buying process easier by putting together the largest selection of complete split systems now available online. hvac-diagram Whether you need an air conditioner & coil plus furnace, heat pump & coil plus furnace, air conditioner plus air handler or heat pump plus air handler, we have options available for any configuration.  We have taken the guesswork out of the process for you.

All of our Goodman complete split systems are AHRI certified.  This means that AHRI, the governing trade association for the HVAC industry, has given it’s independent and unbiased analysis that the HVAC system is properly matched and the efficiency and capacity ratings have been verified.

When selecting a complete system, there are several key performance indicators to take into consideration.

  • Capacity. Cooling capacity is measured by the ton.  Heating capacity is measured as BTU (British Thermal Unit). Capacity, or size, is the 1st performance indicator that must be determined.  On average, 1 ton is equal to 12,000 BTU’s and can cool between 400  and 600 square feet, depending the heat load for the space to be conditioned.  Heat load is calculated by a licensed contractor who considers the square feet, ceiling height, climate/location, insulation and windows and sun exposure to determine the size of your outdoor (air conditioner or heat pump) and indoor unit (furnace or air handler).
  • Efficiency. In cooling, efficiency is measured by a SEER (Seasonal Energy Efficiency Ratio) rating; for heating, it is AFUE (Annual Fuel Utilization Efficiency). The higher the rating, the more efficient the system.  For air conditioners, the minimum SEER rating is 13 compared to 10 on an older system.    For heating, the minimum AFUE is 80%.  Previous to that, there was no minimum, so an old furnace could have a very low efficiency.  This means even with the minimum allowable efficiency ratings now, you will see significant savings on your energy bills when you install a new complete system.  It is best to go with the highest efficiency rating you can afford, especially in extreme climate regions.  The money you save over the life of the system is almost always more than the initial investment.
  • CFM. A function of the furnace or air handler part of a complete system, CFM (cubic feet per minute) relates to the how much air the blower can send out. Usually, a particular sized furnace (i.e. 60,000 BTU) will have more than 1 CFM option.  You need approximately 400 CFMs per ton of cooling.  If, for example, you have a 4 ton air conditioner or heat pump, your furnace or air handler will need to be 1600 CFM.
  • Dimensions of Indoor Unit & Coil. Depending on where the furnace or air handler is being installed, you may have space limitations.  Be sure to verify how much room you have for the indoor unit (your contractor should be able to confirm this for you), especially if it will be installed in a utility closet or a tight corner of the basement or attic.  Keep in mind that you will need space for the evaporator coil to sit on top of the unit.  Additionally, you will want to buy a coil that matches the width of the indoor unit.  Coils come in A (14”), B (17.5”), C (21”) and D (24.5”) widths, which match the widths of the indoor units.
  • Configuration. Indoor units can be upflow (air blows up) or downflow (air blows down).  Upflow furnaces and air handlers are installed in the basement, but could also be in a utility closet or garage.  Downflow indoor units are installed in the attic.  Select an indoor unit based on where your unit will be installed.  Additionally, for either upflow or downflow, the indoor unit will be either horizontal, vertical or multi-position.  Most new units are multi-position and can be installed either vertically or horizontally.
  • Other options. Some options are based more on preference and budget, such as blower speed.  Blowers can be single, multi or variable speed.  Single is the least expensive and blows at single, constant speed.  Multi-speed is better but more expensive because the blower blows at different speeds for heating and cooling.  Variable is the most expensive but most efficient.  With variable speed, the blower ramps up and down based on conditions/load such as temperature and cleanliness of the filter.

Have questions about complete systems?  Feel free to call us at 1-800-880-0199 M-F 9 a.m. to 5 p.m. or e-mail us at anytime.

Take advantage of $100, $150 or $200 off any Goodman complete central split systems through 9/15/14.




Leave a Comment