You have to thaw it out.
What size of central and heat unit do you need for 916 sq ft?
All are essentially the same latent heat .... energy per unit of mass.
Central HVAC provides central air conditioning, central heating, and central ventilation packaged in one unit. As such it will heat, ventilate and cool your home.
my copper lines freezing on central air unit.
Installing a central air and heat unit in your home provides consistent and efficient temperature control, improved air quality, increased property value, and energy savings in the long run.
To cool more than two rooms it is economically more efficient to purchase a central air conditioning unit than a wall unit. Wall units are individually cheaper than central air, but if you have to buy more than two, then it is better to buy the central air unit.
The outdoor portion of the central ac unit is what gives up the heat from indoors, so it has to be outside. For a more thorough explanation see the question: How does air conditioning work.
is it really run ning or is it possible that you have a heat pump system and it is the heating portion of the system operating?
There is not an average cost to buy a central heat and air unit. You will need to purchase a unit based on the square footage of your home, the amount of insulation in place and whether or not you have duct work in place. The price range starts at $1200 and goes up with size of your home.
There should be only one blower to move the air. The unit will have a coil for cooling and a heat exchanger.
Anything that creates heat that is surplus to requirements. Examples in electronic engineering would be microchips such as CPUs. An internal combustion engine APEX :)
Water freezes at 32 degrees Fahrenheit and 0 degrees Centigrade