Sizing and Installation
Your new heating and cooling system should be a custom fit for your home. Sizing and a handful of other installation practices can dramatically affect how well your new equipment will deliver comfort and savings. Expect to pay a little more for a good contractor who follows these practices.
• Calculate the size of equipment
• Seal and insulate ducts in attics and crawlspaces
• Check and correct air flow
• Proper refrigerant charging
• Equipment placement
Calculate the size of equipment
For starters your new furnace, heat pump or air conditioner should be sized to fit your home. A good contractor will not size your equipment solely on the square footage of your house or assume that your existing equipment was sized properly in the first place. Proper equipment sizing is based your home’s heat loss during cold weather and heat gains during warm weather.
The contractor will need to take measurements during the initial visit to your home and ask you some questions. Undersized equipment, with airflow that is too low, can reduce the efficiency of the air distribution and accelerate wear on system components, leading to earlier failure.
Seal & insulate ducts in attics and crawlspaces
If you’re installing a central air conditioner, furnace or heat pump ask your contractor about the condition of your air ducts. A good contractor should be able to test your air ducts to identify and seal leaks.
• Duct sealing should be done by a professional air conditioning contractor.
• In some instances, your contractor may advise you that it is necessary to replace or add ducts. If there are insufficient supply registers (where the air blows into your room) or return air grilles (where the air is taken back into your AC system) in your home, it may be necessary to install additional ducts to accommodate the need for registers or grilles. When possible, ducts should be located within conditioned space. If the ducts must be in unconditioned space (attic or crawlspace) they must be insulated.
Check and correct airflow
For central air conditioners, furnaces or heat pumps there is an optimal air flow for comfort and savings.
• If airflow is too high, duct leakage increases and the temperature at the register is not sufficient for optimal home comfort.
• If airflow is too low, distribution efficiency drops and accelerates the wear on system components leading to premature failure.
A good contractor may find it necessary to test the air flow of your heating and cooling system and make adjustments for optimal performance. Typically, testing and adjustments should be done after duct leakage repairs have been completed.
Proper refrigerant charging
If you are installing a new central air conditioner or heat pump you should know that recent field studies suggest that approximately 75 percent of installed cooling equipment may have incorrect amount of refrigerant. Incorrect refrigerant level can lower efficiency by 5 to 20 percent and can ultimately cause premature component failure, resulting in costly repairs that could have been prevented. A good contractor will use one of three methods, recommended by equipment manufacturers, to verify the correct refrigerant level. These methods include super-heat, sub-cooling, or weigh. Ask your contractor how they verify the refrigerant level is correct.
In addition, you should know that since 1992, in order to protect the earth’s atmosphere (ozone layer), all technicians must be certified to handle refrigerant and intentional venting of refrigerant is illegal. Ask technicians or installers to show you proof of refrigerant handling certification.
Johnson Heating & Cooling properly recovers and recycles all refrigerant from any system before disposal of equipment.
Placement of new equipment is unique for every home, but a good contractor should follow manufacturer’s installation instructions for best results. For example, Indoor equipment should be installed in conditioned space, or a space that is well insulated. The outdoor compressors should be placed out of the sun and kept free of debris. Equipment should be installed in an accessible area for easy maintenance. Allow plenty of room for free airflow on all sides of the equipment. Thermostats should be placed away from direct sunlight, drafts, doorways, skylights and windows.
Call us today at 256-574-3057 and let us schedule an inspection of your home so that we may recommend the proper unit to ensure your comfort.