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Are you saying it is below 71 in the house,and heat will not come on until some time later when it just decides to come on? And can you do some hands on troubleshooting?
Go to thermostat and remove the R and W wire and twist or somehow connect them together. If heat comes on immediately we know issue is in thermostat.If not we may need to concentrate on the furnace
O if you would like to talk on phone we can do so, but there is an addition fee of 18 bucks.If not we can continue here.
To see the wires you will need to remove the front of thermostat by just grasping front cover and pulling off subbase. Then using a small screwdriver, loosen W crew and R screw and move the wire from w over to R and tighten R screw with bot wires.