Can you connect a dehumidifier drain to an existing ac floor drain even though the dehumidifier drain spout is 4-5 higher than the ac drain spout It is backing up into the ac hose.?

By your question I assume you are using an electric dehumidifier to take air laiden moisture from your property. You do not say wha type of property you own but I would recommend you search for SOLARVENTI as a much cheaper answer to your problem