Double-Sizing a Minisplit
Has anyone considered double sizing a minisplit rather than choosing hyperheat? Like many, ive compared performance ratings of minisplit heat pumps. Hyperheat is almost a no-brainer in northern states or so i thought. If you compare the COP of a top performing 9k evi minisplit with an average 18k unit… see graph below. The COP of the average 18k unit blows the doors off a top of the line unit in heating down to about 10°F. admittedly there are three things to think about in doing this. 1)temps below 10°F …most of us use backup below 5°F anyway. 2) oversizing in summer, some installs can turn one unit off to balance load and capacity. 3) Price. Is an average 18k cheaper than 9khyper? In most cases, yes. You are not only getting far more btus with the 18k, you are getting cheaper btus since the COP is higher. The 18k has a larger outdoor radiator to collect heat so it makes sense how it could perform better at certain temps. The high performance unit in the graph is a gree saphire and the 18k is just a typical 18k i found on neep. Let me know your thoughts.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part