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To expand on my initial thought and Bill's as well, depending on the age of your furnace you should have a label with model number, serial number and temperature rise range. I had one recently that I had to speed up the blower on because I was in the high 70 range. I got it down into the low 70's which was acceptable for the model. You could be fighting low temperature rise which could be cold air infiltration or your blower speed could be a little too high. Slowing down the blower will reduce the amount of air moving across the heat exchanger making your supply temps higher. If your return air temp is lower than your home indoor ambient air temp I'd be checking for leaks in your return in cold places (attic or crawl space) that would cool down your return air lowering your temperature rise.
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