Here is a site for heating and cooling degree days comparison years for any zip code. For zip code 32162, it was only 2% hotter for June 2015, than June 2016. So that leaves setting thermostats lower this year versus last year, not having humidistat set for those who have them at 50% as recommended. AC doesn't have to be set as low than. Maybe an appliance was added, company was over this year which takes more AC to keep house cooler, more water heater usage ,more dishwasher usage, lights on more...,Many variables have to be considered. My bill was up about 9% this month versus last year but I also added a spa last month, so pretty flat.
Btw. Insulating my garage door dropped the heat in garage significantly. I also have a thermal gun and it showed 115+ before on door versus 90s now.
Weather Data Depot: free downloads of heating & cooling degree days
Monthly Degree Day Comparison (Station: FLVI View Map)
Base Year (2015) Comparison Year (2016) Comparison Percentages
Month HDD CDD TDD HDD CDD TDD HDD CDD TDD
January 116 75 191 148 53 201 27% -29% 5%
February 117 34 151 97 97 194 -17% 185% 28%
March 9 339 348 9 318 327 -6% -6%
April 0 475 475 0 380 380 -20% -20%
May 0 564 564 0 537 537 -4% -4%
June 0 681 681 0 696 696 2% 2%
July 0 710 710
August 0 707 707
September 0 631 631
October 0 463 463
November 6 419 425
December 8 345 353
Through June 242 2168 2410 254 2081 2335 5% -4% -3%
Annual Total 256 5443 5699