Since you said furnace, I'm assuming you have a residential central air. What I used to do as a quick check for freon load was to check the return line from the evaporator, the large diameter line from inside the house.
Checking at the inlet to the condenser unit, right where the line attaches. If the unit has been on and has the house cooled down, and you have any humidity to speak of, the line will sweat right there if you have a full charge. If not, you are low and low freon is usually the cause for problems such as yours.
If you don't know what you are doing, get a service company to service it for you. Too much is as bad as too little and if using R-22 (says what it is on the side of the condenser unit) you usually have to go to a wholesale house to get it and private citizens can't buy it.
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