I will be installing a 3/4" prefinished oak flooring withing the next two weeks. My concern is regarding humidity and expansion when it comes to the summer months. The current temperature is 40 degress with snow left over from the recent snow storm.I measured the flooring moisture level,6, and the subfloor moisture level of 7.5. The flooring has been sitting in the home for one month,opened end of boxes.I live about 50 miles southwest of Chicago and it gets humid here in the summer.

Any suggestions will be appreciated!

OUTSIDE temperatures and humidity levels don't matter. The flooring is INSIDE your house. You need to keep the INSIDE temperature and humidity levels within the parameters of the manufacturer's recommendations, typically 65 to 75 degrees F. and 40 to 60 % relative humidity. What is the interoir temperature and humidity levels now inside your house?

Inside temperature is 68 deg. I keep the home at 68-80 in the winter and 80-85 in the summerI do not have a measurement on the inside humidity,need to get a meter.

Yep, you need a hygrometer to keep check on the inside relative humidity levels.

Any recommendations on where to get one?

Lowe's, Radio Shack for sure. At Lowe's they are located in the outdoor patio furniture isle, next to the thermometers.

Temperature is 68.9 deg.
Humidity is 44%
Purchased a Oregon Scientific Temperature/Hygrometer from Lowes today, let readings stabilized for 2 hours before taking a reading.

You are already where you need to be. You needn't worry about the floor going nuts in the summer. I doubt your interior humidity will exceed 55 percent in the summer.

Considering this is a new home I expected the moisture level to be higher. I am considering installing a home humidifier to maintain the level during the following winter. I expect to start the install within about two weeks, after I finish the tile around the soaker bathtub and grout that bathroom. I am considering purchasing the flooring stapler from HF, about 10 minutes from where I work, instead of renting a stapler.

Mad1: I am in about the same situation and location as you. My install may start within two to five weeks and I am considering the harbor freight route myself. I do have a bostitch MFN200, but I am considering the idea that using a manual nailer might cause my body too much pain.

If you do use the HF stapler or nailer, please post your experience. There has been at least one member here who has used one and found no issues.

Please also consider the $20.00 'insurance' on the purchase. If it breaks, misfires, gets tossed across the room, or gets dirty; just bring a piece of it in and HF will issue a new unit within a years time period.

Thanks for the info. on the insurance!

Their return policy states,
"100% Satisfaction Guarantee!

Products featured by Harbor Freight have passed rigorous inspection by our quality assurance team. Our 100% satisfaction guarantee is our solid commitment to you that if for any reason you are not satisfied with any item, simply return it for a fast, courteous, hassle-free refund!"

Purchased the Bostich MIIIFN, uncertain about the quality of the HF tool.

the harbor freight stapler would probably be good for one or two floors but certainly not good enough for a long term investment.

I have recommended it to people that thought they would rent one at 35 dollars a day and coyuld only work on weekends . it made more economic sense to just buy the harbor freight stapler

i bought the floor gun from HF. i used it to install 1200 sf of brazilian cherry, however i used bostich cleats in the gun and not HF cleats.

didn't have one problem with the gun at all, and any errors were my fault. unless you plan on doing floors for a living, the HF gun is a good deal. they also offer a 3 year no questions asked full warranty on the gun. simply bring it back and they give you a new one. for self installations, you can't beat that.