~2000 sq foot 1 story home in Dallas / Fort Worth, Texas area, all electric, built in 1984, all single pane storm windows, lots of large trees, shade.
Current system is an inefficient 4 ton ac with updraft electric furnace. I'm looking to replace entire heating / ac system with new heat pump / air handler.
Vapor barrier on two ducts in attic has been severely damaged by UV, remaining ducts have some small holes in vapor barrier. I am trying to decide whether to replace the entire duct system or to just replace the two damaged runs. I am getting varying opinions on whether an entire new duct system is worthwhile / necessary.
Both options include new lineset with cover, new pad, new whip/disconnect, load calculation, 10 years parts and labor, 1 year free maintenance. We are assuming 4 ton system unless load calc says otherwise.
Here are the options.
Lennox XP16-048 Heat Pump
Lennox CBX32MV-060 Air Handler with ECB40-15CB heat kit
Lennox icomfort wi-fi thermostat
5" media filter
American Standard Platinum XM16 Heat Pump
American Standard Platinum XV Air Handler with 20kW heat
honeywell red link with interface ctrl board and modem
Perfect Fit 5" media filter
I'm looking for a comparison of these two options, pluses and minuses of each. Any specific questions I should ask? Any options regarding the equipment / thermostat I should ask about? I am confident that both contractors would do a quality install and stand behind their work.
Any advice would be greatly appreciated!