Is it ok to shoot gunnite pool in the middle of winter?

HI
I am researching potential probs for a gunnite pool shoot scheduled for this weekend (Dec 17) from a reputable pool contractor. That said, the contractor subs out this part of the pool build project. I am a landscape designer and in this case acting as GC for the project as well. My instincts tell me its too cold to do anything with a concrete mix now but ive been assured that they do this all winter long without it ever being an issue. Can anyone provide a short list of questions I should have them answer before they start? Thanks
PS - I did read the now defunct thread on a similar topic posted in this forum years back but it didnt really provide any type of clear cut check list . The concensus was that it could be done but that 'precautions had to be taken' . Im wondering what specifically those precautions might be.
Thanks so much, ive installed hundreds of hardscapes , a few of which were structurally quite complicated, but never a pool so Im a bit nervous.


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I am a pool builder in new jersey all the pools i build are along the ocean towns so we are not allowed to build pools in the summer do to all the summer homeowners are at that there shore homes so that means all the pools need tobe built from October to May and right now I have one started and 2 getting ready to start my rule is that if temperatures at night get below 30 I will not shoot the pool we try to time the shoot with the temperatures but after shoot the pool i will cover the pool with plastic for a couple days cause curing concrete gives off heat and it stays retained in structure and helps cure the concrete. On smaller pools under 25x13 i will also add concrete blankets like when we pour concrete. So if I get all these pools dug and rebar installed I might end up renting heaters If I can’t get the right temperatures after a couple of weeks of waiting. There is nothing worse than having issues with it not curing right. I also have to deal with dewatering the hole from the time I dig until the time the structure is cured
 
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