{ lennox high-efficiency heating and cooling unit : CHP20V: 12:00 to 12.60 seer }
I recently changed the filter for this unit and it stopped putting out heat. It seems to be working, the fan is blowing, but its cold air that's coming out. Tis the season to have heat! Any suggestions?
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Any suggestion is greatly appreciated

Did you try putting the old filter back in? Jus' kiddin'... okay, what do we have here, heat pump, gas furnace,. where does the filter go in relation to the indoor unit? Any small wires nearby?

I don't think chp20v is a Lennox model number. Did the furnace work OK before you replaced the filter?

Before I replaced the air filter, it worked fine. It's working OK now, the "compressor?" wasn't turning on. Now its seems to be heating up OK... its a central heat/air that's located on the roof. Thanks for the help...