I like it earlier
I have to say that when I have to have any long and drawn out task done, I like to get it done early in the morning! That way, by early afternoon it should be done and over with and can go about the rest of my day in peace.
This is how I especially feel about heating and air conditioning installation and repair.
You never know with heat and a/c repair how long it is going to take. So I always try to schedule any heating and air conditioning specialist to come out and repair my central heat and a/c unit when needed in the early morning. Now when it comes to heat and a/c installation, it is even more important to me to do it early as possible. When I got my last brand new central heating and air conditioning system a few years ago, I had them come at 7am when they first opened up! They actually preferred this too. But the point is, this whole big job that was a major task was done and over with by around 1pm, and I had the rest of my day free. That was a major relief for me. Had they come in the early afternoon, it would have shot my whole day and I would not have been happy. So this is just a small example of why I like to do big long tasks early in the morning. It could be heating and air conditioning repair or installation or even construction or house remodeling. It is all the same to me at the end of the day. Just get it done!