Hi,

We are getting engineered hardwood(Red Oak) and Prefinished Hardwood(Bruce Dundee Oak Fawn(looks like white Oak).
To acclimate do you need to place them in the same room as installation?
The Hardwood will be for the 2nd floor and Engineered for the 1st floor.

Please advice, Thank you!

Solid wood ought to be installed halfway between the ambient conditions of winter and summer where you live. You will need a moisture meter to get a value for the present moisture content. You know the temperature and humidity of your house when you are comfortable in winter this will give a width for when it would be acclimated. If you have continuous air conditioning during the summer you will be able to get the moisture content for summer conditions. Each value will give a dimension of you hardwood flooring strips, so you will need to find the compatible moisture content at which the flooring will reach to be in the middle so you will not have cupping in the summer or big gaps in the winter.
If you don't have a moisture meter and want to keep it simple, then acclimate the flooring to conditions in the spring or fall and lay the flooring then.
Most people would like slight cupping in the summer when it's humid outside with hardly any gaps in the winter when the warmer air inside is has less moisture. With conditioned air in the house year round the moisture in the flooring will be more stable.

Thank you Pete. Our 1st and 2nd floors are kept at 72 during winter, so since both are the same temperatures, it would be ok to just store them downstairs?

Downstairs is ago. Just bring up the flooring 3-4 bundles at a time when working upstairs so you can stack bundles out of the way close to where it will be installed.