delta t - the delta t number installers in Boise argue about.
Two bids can look similar while assuming different delta t values; the cheaper one often specs down. Ask for the figure in writing and check it against the manufacturer datasheet before you sign.
Garden City, Harris Ranch and Southeast Boise: Local housing mix shapes sewer line repair specs here. Year-round sewer line repair demand in Boise. Updated for sewerline boise searchers.