I do joint filing along with my spouse. 

Question 1: I see "Non-business energy property credit" to be capped at $500. Is it per person ($1000 in my case) while filing (or) for a house ($500)?
I am confused reading the instructions as well https://www.irs.gov/instructions/i5695

Question 2. How does turbotax handle this?

Question 3: With inflation reduction act that's on the fly now, it's raised to $2000 for heat pump installation. If each person in couple can take it, then can we claim $4000 for the same heat pump?