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00:09 so here at certified solar heating air 00:11 conditioning we tend to get a lot of 00:13 questions asked when we're in the home 00:15 either talking about maintenance 00:17 IAQ or new equipment whatever the case 00:19 may be one of the questions we get asked 00:21 all the time is what size system do I 00:24 need so it's a really general question 00:27 because every home is different 00:28 sometimes we go to a house and it's got 00:30 let's say a five ton unit installed and 00:33 really it only requires a four time unit 00:35 there are certain measurements and 00:37 calculations that have to be done to 00:38 actually figure out what size fits in 00:40 the home and meets the needs for the 00:42 heating and cooling demands so it's not 00:45 just a exact science of five hundred 00:47 square foot per ton per ton it's not an 00:50 exact science of take out what you've 00:52 got and just put it back in the same 00:54 size sometimes it actually requires some 00:56 knowledge and experience in the industry 00:58 and what needs to go back in