Gearing up to replace our ancient HVAC system. Looked at geothermal but it's not cost effective for our situation, so looking at an air-to-air heat pump for heating and cooling. Got bids from Trane and Carrier vendors, comparing and contrasting. The existing A/C is Carrier, and that part of it still works fine. I hear Trane was acquired by Ingersoll-Rand a few years back, trying to figure out what impact (if any) that has on product quality.