Hello:

Have two questions regarding a contemplated new gas forced
hot air furnace.

a. Regarding the Filter for the furnace:

Anyone have any opinions on the Air Bear brand of filters vs the Dynamic
Filters Company ones, which are apparently an electrostatic type ?

Pros and cons ?

b. Realize there are a zillion variables involved such as insulation,
windows,
house orientation, etc., and that a Manual J is really required, but was
wondering if there is a generally accepted, very approximate, rule-of-thumb
"yardstick" for furnace size in BTU/hr ?

Perhaps as a function of house square footage per level ?

Would be for a typical multi/split level in northern New England

Thanks,
Bob