You don't need to worry about drywall cracking but the pipes aren't going to stand those temperatures without spliting. I'd turn water off and drain pipes til it gets above freezing or the place is insulated.

We will have furnace going and there aren’t water pipes in the attic area.

Whether it creates a problem depends on the amount of air leakage into the attic and the amount of attic ventilation. Your insulation contractor is in the best position to advise you.

Let any water pipe location drip slowly over the low temp time period.

My advice - this actually happened last year: unless it absolutely can’t wait until March or later… cancel and wait. We had a squirrel issue and the contractor took all of the insulation from our attic (Jan 15, 2023) and due to a misunderstanding it was over a week between removal and our scramble to find someone to put new insulation in. It did cause a crack in our garage drywall although no issues inside. We live in IL so strongly recommend waiting. The real issue was the house having a blasting furnace for a full week with under 10 degree temps. Frankly it wasn’t warm the entire time.

Thanks everyone, we are going to go for it!! We moved up the refill to the next day so it should be 14-16hrs max being empty. It'll be airsealed on the evac day and we have double thick drywall ceilings, which should help. Additionally I'll keep house at a low low humidity level and lower than usual temps to avoid a HUGE contrast and condensation possibility!

If I don't write more, assume it went great. If the house falls to the ground, then I will be sure to post pictures!

It is interesting to note the difference that air sealing makes versus insulation R-value.

Yes! I always read it was the most important thing to do. Now I’m 100% a believer