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Insulating behind existing drywall

We recently finished off our basement. Over the 2x4 walls are moisture resistant drywall. My husband neglected to drywall behind the walls thinking it would stay cooler in the summertime that way, but this winter is proving to be very cool down there. Our quartz infrared portable heater can't keep up with keeping it warm. We were wondering what is the easiest way to get insulation behind those walls without wrecking the drywall? We have acoustic tiles on the ceiling so we would have access at the top of each piece of drywall.
Thank you.

Re: Insulating behind existing drywall

blown in fibreglass or cellulose, or for the extra $$$ there is poured expanding foam

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