People are often uncertain if they can change their existing ducted evaporative air conditioning over to the ducted reverse cycle air conditioning or HVAC system with the same outlets and ducts. The truth is, you cannot do that.
Why Switch to the Reverse Cycle
- The reverse cycle outlets or grilles are generally placed near the windows far from the doors. This lets the air to control and condition the heat or cold which enters straightaway from the windows. For the reverse cycle system, the airflow is required to travel a little longer from the outlet to the return air grille. In case the outlet is located beside the door, the air would just be sucked back beneath the door, to the return air grille with hot spots near the window.
- One of the problems with the evaporative grilles is that they are generally situated next to doorways. The airflow within the evaporative units requires taking the longest paths into the room and out through the windows. Whereas if they are placed beside the windows, the air would just flow out and the doors and other corners of the rooms would have these hot spots.
- You should not place the reverse cycle air conditioning systems in a place where your duct evaporative grille was formerly positioned. As it will drastically reduce the effectiveness of the system and its capacity. This is why it is best to start afresh and place the new reverse cycle AC grilles in the appropriate location that is required. For this, you may have to paint and patch the holes in the ceiling as you have to remove the old evaporative AC, which can be an expensive affair.
- For installing the reverse AC system, add extra grilles and leave them near the doorways or near the window.
Things to Consider while Swapping the Systems
There are a few problems that may crop up while planning to switch from the evaporative air conditioning to the reverse cycle air conditioning systems. These are:
- You cannot use the old ducting system. You need to let it go. The ducts that are used for the evaporative units are much larger than the ones which are required for the reverse cycle duct air conditioners. The evaporative air conditioners use ducting of about 16 to 20 inches. It require such a large size because the air blows very fast. This draws in air which has a volume of around 40 times the cubic area of your home per hour. Ducting for the reverse cycle systems is generally around 12 inches in diameter because the reverse cycle systems are slower than evaporative parallels.
- Another drawback of the evaporative ducting system is that it is slightly insulated, if at all. The ducting for reverse cycle systems should always be at least 2 inches as it preserves the cooling or heating, and prevents condensation.
If you are looking forward to swapping your present evaporative system to a brand new reverse cycle ducted system, it is best to do your homework. Get a few quotes so that the costs can be estimated and have the ceiling painted before work begins. If the contractors tell you that they will just be able to swap systems rather than using the existing outlets and ducts, remember to ask a lot of questions to have all your queries answered because you are paying good money to install the reverse cycle air conditioning systems, but if it does not work efficiently, the professionals may not be around to help.
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