Heaters run off of natural gas. Due to colder than expected Winter, the U.S. has dipped hard into our storage causing nat gas prices to rise. A/C's run off of electricity. U.S. produces an abundant amount of nat gas. With warmer weather the price will come down. Profit
Simple supply and demand issue. Last April DGAZ hit 22ish.
I am sure there are fee's involved. I just like the opportunity to get in at 3.70 with warm weather ahead. Heck it's already up to 3.78.