HVAC in Wyoming fights wind that steals heat from the windward rooms and sun that bakes the south glass while the north side lags. The burner can be fine and the house still feel uneven. That is infiltration and a real load, not a mood. Dust loads the filters after every long blow, especially in the basins where the ground is bare. Say whether the equipment will not run or the exposed rooms will not catch up. Those are different visits.
Wind changes draft. A flue or an intake on the wall that takes the gust can ice, pull poorly, or shut a high-efficiency unit down. Look at those terminations before you condemn the furnace. If you smell combustion trouble, stop the unit and say so. The heat exchanger and the flue come before comfort talk. Rooms over a garage and ducts in a cold attic give the heat away. A thermostat in a sunny room will lie about the rest of the house after the glare fades.
Cooling is a shorter need in much of the state and a real one in the lower basins on a hot, bright afternoon. Do not pretend every Wyoming house is only a furnace. Ask what was ruled out: filter, coil, ducts, and a condenser packed with wind-blown seed. Replacement should be sized for this exposure, not copied from the old label. Efficiency labels compare a test. They are not a promise about fuel. Matched equipment is a different scope from a new box on an old coil.
Propane on rural places runs out, and that is an emergency of its own. Town gas in Casper, Cheyenne, or Rock Springs is a different supply story. Say which you have. Schedule the serious work before the hardest stretch if you can, because a no-heat day here is the whole house. Elevation and a wide daily swing make a brochure size a guess. Mention the town so the wind and the winter length are not abstract.
Say heat or cooling, the town, and whether the failure is the machine or the windward rooms. Mention a termination that ices or a filter black with dust. If the house is cold now, say that first. Call the number on this page.