thanks for that background info, but i'm not sure it addressed my question for a couple reasons:
1. i asked "rebates" and "heat pump" specifically because it's one of the improvements specifically called out in the bill. notably, it's eligible for a 8k$ rebate, which is pro-rated based on income. additionally, there is a separate 2k$ tax credit for people whose income is to high to claim the rebates. i don't think the smaller 30% general "energy efficiency" provision applies when you use these rebates, although i could be wrong.
2. i asked if you have to own the house for the whole year. this is really the core of my question as per the subject line. i don't think that question is addressed in any of the links you provided. specifically, it's not clear if 1. you have to own the house or 2. for the whole year
