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We purchased an 18K condenser and two 9K wall mounted Fujitsu's earlier this year. Before your HVAC guy arrives, take a look at the EComfort website and see the cost of their 24K packages (
Heat Pump Wall Mounted - Dual Zone - eComfort.com). Ask the HVAC guy for a breakdown (materials and labor). Compare the cost is if he supplies the system and if you supply the system - I bet you will see a
significant difference in cost. You will have to get the linesets (which are not cheap) but the cost of materials from EComfort versus purchasing from an authorized dealer was vastly different... I mean vastly!
Be aware that most mini-split manufacturers will not warranty their products if NOT purchased from an authorized distributor but EComfort has a nice and attractive warranty (
Warranty Claims - eComfort.com). We had a very pleasant experience with EComfort. Take a look at GarageJournal ('heating and A/C' section) as there has been several discussions regarding mini-splits, DIY installations (which I would not attempt), brands, and where to purchase the mini-split systems.
VincentVega - I found that sizing units was maddening. Each calculator I used arrived at much different numbers. This one (
Interactive Mini Split Sizing Calculator - eComfort.com) made the most logical sense to me but my calculations deviated from what the HVAC engineer at EComfort calculated.