The air conditioned part of my house is less than
1800 sq ft. The repairman thinks the accumulator
has a leak which he says cannot be repaired.
What is the expected price range for replacing
the whole outside unit?
My house has oil heat so it better not be a heat pump.
This unit takes freon and is 21 years old. I live in
west suburban Baltimore.
If this unit is replaced, the new unit would take
R-410(?). I just need a price range before I talk
to someone about it.
Maryland may be south of the Mason-Dixon line, but it
is in the "Land of the damnyankee Snow". Everyone I
know who has one curses it in the dead of winter.
The price of oil and all other petroleum products is
already insane. The price of gasoline in Kuwait is
less than 50 cents a gallon.
On Tue, 10 Jun 2008 14:38:29 +0000 (UTC), firstname.lastname@example.org (Dick
I live in Phx and have found heat pumps to be barely adequate even for
our mild winters. I replaced my heat pumps with straight AC units and
put electric heat strips in the air handlers. Hasn't seemed to made
much difference in my electric bills but it sure warms the house up
On the hardware end of things, a 2 ton condenser R-410 with a 2.5 ton
high efficiency coil runs about $1,000 wholesale. So expect to pay
about $2,000 for the equipment and about $750-$1000 for installation.
That's for a 2nd tier name brand like Amana, Goodman, etc. For top
name brand like Lennox or Carrier, add another $500 to the hardware.
On Mon, 9 Jun 2008 17:51:16 +0000 (UTC), email@example.com (Dick
Does brand name infer a high effeciency vs. a 2nd tier brand?
My house is a two story ranch built into the side of a hill.
The lower level/full basement opens unto the back yard and
is not air conditioned. Due to ventilation, the temperature
in the finished part of the basement never gets above 74F in
the dead of summer. My wife and I plan to sell in the near
future (1-5 years).
I previously wrote the A/C part of the house is less than
1800 sq ft. After doing the math, I figure the A/C part
at 1650 sg ft and the full basement which needs neither
A/C nor heat (due to the heat from the oil furnace itself)
at 1850 sq ft.
Where can I verify that a 2 ton condenser R-410 with a 2.5
ton high efficiency coil is the approriate size I need?
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No. Altho some manufacturers/brands may not have units as efficient in
their line as the top in another, the brand alone is not enough.
2T is 2T of cooling -- the efficiency only enters into how much it costs
to provide that cooling (in first order approximation).
To verify the cooling you need for a given application one needs a
competent analysis of the structure and heat load according to the
ASHRAE guidelines. A qualified contractor will be able to do this and
show you the results. A typical contractor who tells you what you need
simply by square footage may or may not get it right depending on what's
going on behind the scenes...
Also, the experience with the existing unit can be useful. If you
know it was X tons and cooled the house about right, that's one data
Somewhere in one of the original posts it was mentioned that just
changing the outside unit was under consideration. I think that
would be a big mistake. The rest of the unit is 21 years old too and
new units need the evaporator changed to get the true efficiency.
Also, mixing and matching raises all kinds of problems, including
warranty issues. I like the idea of going with a heat pump, as it
gives you dual fuel flexibility and it sounds like a good option in MD.
The old R-22 equipment is not compatible with the new 410a equipment. Most
parts houses have some older equipment still in stock, so please be sure to
get a condensing unit that uses the same refrigerant. Of course, your AC
service tech will already know that.
The newer equipment is much more efficient.
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