I'm deciding between the top of the line Lennox Heat Pump (XP 19) or the Carrier Infinity 17. I will need 4 ton. The SEER of these 4toners works out to 17 and 14. Will that be a huge difference for me. I live in the Philly area and will need primarily heat from these. Which would be better and why? Both on a variable speed oil furnace. Also what do you think of the Honeywell VisionPro 8000 with dehumidification control. Thanks