Are you certain you want boiler heat coming through floor during summer. I'm assuming boiler is never off because it handle's domestic hot water supply.

Good thought Klem1, but I think the warmer floor in the winter offsets the potential heat in the summer. The family room is cooled by central air and my workshop is to the right of the boiler. I usually keep the outside doors in my workshop open in warm weather and add a fan if it gets too hot.

Actually, removing the insulation will make it exactly like the rest of the basement, which has exposed joists. I'm going to try it and if it doesn't help, or makes it worse, I'll install new insulation.

Thanks for your input.

Basements tend to be cool in the summer, so even with the boiler periodically firing I highly doubt it will be a problem.