We are renovating a ranch house in CT. We have ripped out the old ducting in the areas of the house we are renovating and are planning to add A/C. The house has 1500 sf on main level and 600 sf on lower level. We currently rely on an early 1990s Thermopride Oil Furnace for heat, which works well.
The house is "California style" with glass walls in the living area facing east.
The contractor has judged it to require 5 tons. How do I know that he properly performed Manual J calc? Is there a way to tactfully confirm that he didn't make a guess based on all of the glass? It doesn't get above 90 degrees too often and we are looking for A/C to dehumidify as much as to cool.
The HVAC contractor has recommended the following system:
Carrier Oil highboy 58CMA
5 ton Coil CNRVP
5 ton 24ACR (freon)
Programable thermostat-1 zone
There is also:
an option to upgrade to a Thermopride furnace and
an option to upgrade to 5 ton 24APA5 (puron).
As our current furnace works well, we wonder whether it is a good idea to keep it and just add the coil and condenser. We have the furnace serviced yearly and the service guys always say the unit is running strong and could have 10-15 years ahead of it.
On the condenser, it seems that Puron makes sense and for a few $$$ more the upgrade is worthwhile.
Finally, we would like to place the condenser approximately 50 feet away from the coil. The condenser will be on ground level and the coil will be at the height of the furnace. Given the need to run the lines out through the ceiling there is the need to elevate from the coil 6 feet or so and then descend from the ceiling to ground level-approx 9 feet. Will this distance cause any problems for such a system.
Thanks for taking a look.