Why not sell them directly, or via well known retailers, at the highest price point and with the longest warranty?
e.g. McMaster-Carr with a 10 year in-home repair warranty.
And you can still offer discounts via other lower price channels.
> 10 year in-home repair warranty.
The vendor travels to the house and repairs it? One warranty claim could wipe out a startup.
Do you not understand the concept of budgeting for warranty costs in the pricing?