Posted by MarkB_MI on October 08, 2021 at 17:44:18 from (174.211.38.233):
In Reply to: Home HVAC unit posted by john in la on October 08, 2021 at 17:16:03:
John, I installed a ductless mini-split system in our house a few years ago, but we have a different situation than you. Our house didn't have central AC, and because it has hot water baseboard heat, there's no ducting. Being a quad-level, adding ducts wasn't really practical. I wouldn't recommend replacing your central air with ductless; if it were my house I would replace the existing air conditioning system with a newer, more efficient central air system.
The ductless systems come pre-charged with enough refrigerant for a given lineset length. (Lineset being the high pressure/low pressure pair of lines.) I don't recall what it is offhand, but it's fairly long, maybe fifty feet total. Note that each unit has its own lineset, so if you have two indoor units, each with 25 feet of lineset, that's fifty feet. If you have more lineset than what the pre-charge is good for, you have to add a specified amount of refrigerant for the additional length. I don't think there's any practical limit beyond that for a typical house.
If you have a particular system in mind, download the installation instructions for that system and it will say exactly how long the lineset can be before you have to add more refrigerant.
Note that the ductless units need to be cleaned regularly to prevent mold and mildew buildup, which is not an easy task. We ended up paying several hundred dollars to have our units disassembled and cleaned after they basically quit working. They make a large funnel you can place under the units and flush them out with bleach; I'll do that yearly from now on.
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