What could this guy be talking about? It takes weeks to swtich from
heat to AC? On a building built in 1970?
"Why did I want a portable air conditioner? I live in a condominium
apartment that was constructed in 1970. The hvac system is one that can
supply either air conditioning or heat but is not easily converted. This
is a central unit that serves all 300+ units. The heat is turned off
around mid-April and over a period of weeks is converted to provide air
conditioning on May 15th. I live in the Washington DC area and we have
some very warm days between these dates. "
His last sentence is true some years, although inside my house it
doesn't get warm that quickly.
I was on a ship like that. If we went from the Labrador Current to the
Gulf Stream, we might swelter for a couple of days.
Each compartment had a unit with a coil and a fan. For heating, the
circulating water came from the boiler. For cooling, it came from a
chiller. If they didn't wait for the water to cool, they'd rupture disks.
In addition, I think HVAC guys had to make a change for each compartment
unit. The more units you have, the longer it takes.
On Sunday, June 22, 2014 12:57:42 AM UTC-4, micky wrote:
Sounds like crappola to me. More likely it's the policy
of the condo. And being a condo, the owners could change
either the policy or the equipment. If this was a real
problem with weeks required to change something over, it would
be a disaster for similar buildings, eg office buildings, commercial buildings. I don't ever recall it being a problem. And if it
took weeks, what would the cost be? Good grief.
George Washington University has an HVAC staff of 14, including licensed
engineers. It can take 36 hours to change one building, but it's mostly
waiting for the water to cool. Working around the clock, they need at
least 2 days to do the 130 buildings. A hot-blooded user might wait
weeks because they can't start until most people won't mind losing their
On Sunday, June 22, 2014 9:08:25 AM UTC-4, J Burns wrote:
Since you say it takes 36 hours to change over one
building and most of that time is waiting for the water
to cool, I guess you agree that it's crappola that it
actually takes a month to switch over a condo building.
I don't know if changing a condo could be as much work as changing a
campus building. If it were, GWU's crack staff of 14 might do it in 5
days. A smaller staff might take a month.
I imagine another possibility. Maybe the condo depends on a contractor,
and it has to be scheduled months ahead. To reduce complaints of being
cold, maybe it's not scheduled to start until May 10. If it gets hot in
April, the board says, "We're working on it."
A four-pipe system makes both heating and cooling water available to
each unit. A developer can save money by using only two pipes, although
it entails annual discomfort and labor costs.
The old save a dollar system. Use one set of pipes and coils and switch
either hot or cold water instead of using 2 systems so you can have either
cool or heat whenever you want.
So everyone gets hot or cold at the same time even if you want it the other
Most? swimming pools in Maryland have that policy too. I understood it
when I lived further North and it was never hot in May, but here it's
hot in May sometimes and in September for sure. I know it has to do
with school kids, but when I went to school The weekday before Memorial
Day was our last day, and the day after Labor Day our first. They don't
do that here either.
I would hate to live like that. In my house with a heatpump or the house I
used to live in with air and a gas furnace, I could go from heat to cool in
the length of time it takes to walk to the thermostat. During the spring
and fall, it is often heat at night and cool during the day.
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