What will really happen if I install a 13 SEER outside unit to existing 11yr old 10 SEER inside unit Heatpump?
Question:A/C repair and installation companies are eager to sell me the entire unit for various reason such as acid in the existing system components could damage the new compressor or that the new compressor would be put under additional strain and not last long (or vise-versa). Likewise, I see industry marketing pushing the same thinking... Is this really true?
The outside unit to be installed is a Goodman and the inside unit is RUUD. Thanks.
Answers:
the unit will operate but not properly ... it could actually give a seer rating far below 13seer...(*as low as 8 seer) it is much more critical to a heat pump system to be properly matched, further to this is the system will be incredibly hard to get the initial refrigerant charge anywhere close to right because the mismatched coil will give improper superheat and subcooling readings making charging of the system properly sheer luck. this could result in your brand new heat pump that is supposed to be higher efficencey use more hydro than your old unit to produce less btu's of cooling...bottom line do not ever do this...ever...these guys are not pulling your leg...i also agree with the other answerer...stay away from Goodman, they are generally more of a "thrifty" type of brand and get most of their market share based solely on price and with a heat pump you pretty much get what you pay for so i would take a look at a better brand.
You are better off matchng the entire system to obtain the 13 SEER level of efficiency. You will not obtain it matching a Rudd 10 SEER to a Goodman 13.
In addition, and not picking on you for selecting Goodman, however they are not really rated very high. Stick to the Ruud or comparable units like Lennox, Trane, Carrier, American Standard.
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