[Greenbuilding] New HVAC unit

[Bob Waldrop]

We are in Oklahoma City.  We have 9 inches of insulation in the walls, 14
inches in the attic, ceiling fans in every room, R-20 insulated shutters for
all our windows (and some of the doors), some other miscellaneous interior
fans, and most of our building envelope is shaded by our vegetation. We cook 
outside in the summer.
We have 1548 square ft.  We AC our house with one 5K BTU window unit AC.  I
don't know how that converts to "tons", but it's not very much AC, lol, 
since it is only supposed to cool a 120 sq ft room.  Our
theory is that with the shade, extreme insulation and etc., we keep the
indoor apparent temps down, and the AC basically acts as a dehumidifier,
since there isn't anything passive that you can do about humidity.

Bob Waldrop, OKC

-----Original Message----- 
From: Bobbi Chukran
Sent: Wednesday, June 01, 2011 2:02 PM
To: Green Building
Subject: [Greenbuilding] New HVAC unit

Hi guys,

As mentioned, we've just bought a 1930's home here in Central TX that
has no HVAC system.  We got a quote for this unit:

Carrier/Bryant
3-ton/2-speed
Puron refrigerant
17.5 SEER HVAC system with gas heat.
Silverback flexduct (optional), copper refrigerant lines,
condensation drain line and low voltage wire for thermostat.
Supply and return registers
HW 6000 thermostat
4" media filter for allergy control

We also have the option of doing metal ductwork instead, and we've
planned on doing that.

This sounds good to us, but I'm wondering if y'all have any thoughts
on it.  The main thing we're questioning is the size of the unit.
The home is 1421 SF, one story, uninsulated (for now, but we're
adding that), awnings over all windows, most of which are the
originals.  I plan on fixing them up, caulking, weather stripping,
all that good stuff. The unit will be in conditioned space.

Is this a good choice for us?

Thanks so much!

bobbi c.
Leander and Taylor, TX


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