Heat pumps Home › Forums › Public Forums › General Plumbing › Heat pumps This topic has 1 reply, 2 voices, and was last updated 23 years, 10 months ago by Art_xyz. Viewing 1 reply thread Author Posts 10 Nov 2000 at 7:08 am #273860 MasterPlumbersKeymaster I have 2 “DAY & NIGHT” heat pumps and the filter size in both units is apparently non standard. Have you ever run into this problem and if so, what do you do to get around it? Best Regards,John 10 Nov 2000 at 11:19 am #288714 Art_xyzParticipant You can have custom sized filters made. Check with your hvac supply house. Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In