Acclimation is about 2 things: The FLOOR'S temp level and the LIVING SPACE temp/humidity level. When the two are MILES apart, you have problems. When the two are close enough to be indistinguishable then we have very few problems.
I say: "Document, Document, Document!" I would WRITE AN EMAIL stating your concern. Forward that email to a second person's email so that you have a witness to it being sent.
Technically a "builder's warranty" ends if there are NO COMPLAINTS. If you send an email TODAY (well inside their 1 year period) you have EXTENDED the warranty. By COMPLAINING in writing TODAY they are FOREVER responsible for it and must correct it....even if the real problem shows up 18 months later.
You can leave it for now...if you feel comfortable doing that. I would contact the supplier and have them CONFIRM IN WRITING that they store their flooring in climate controlled conditions (these will be "living conditions") and have them TELL YOU what those conditions are. Then confirm that the order was removed from storage and delivered the SAME DAY to your build site (if it sat over night in a freezing truck or took 7 days to reach the house, this storage is null and void). So long as the floor was stored at living conditions (and delivered same day out of the warehouse) then the "floor" part of the equation is doing OK. It can be installed MUCH SOONER than normal.
Next, you CONFIRM in WRITING that the HOUSE CONDITIONS on the day the floor arrived was maintained at "living conditions". That means the HVAC was turned ON and was RUNNING for at LEAST 48 hours prior to installation (I require it to be 10 days...but each floor manufacturer has their own requirements...read the Shaw requirements and then confirm that was done).
Those TWO THINGS (floor condition and house condition) will combine to create a single "acclimation" situation. I've seen hardwood delivered out of a climate controlled unit be delivered and installed on the same day (into a FULLY CLIMATE CONTROLLED HOME) without any problems.
I've seen "acclimated for 2 weeks in the house" floors buckle and heave because the HVAC was not "on" during these two weeks. The moral of the story is: the HVAC is part of the story. The storage of the floor is the other part of the story.
The builder warranty is extended the minute you make a complaint. Chat with Shaw. Chat with the supplier. Chat with the guys on site that day. Gather the information and DOCUMENT it. Wait until summer. If something is going to happen it will happen during a change in season. But make the complaint soon...and in writing.
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