New Gas Forced Hot Air Furnace Quest's: Filter Brand, And Furn. Sizing ?

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
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.