AC units Two Speed Air Conditioning Units|air conditioning heat by tom durbin|dallas

Tom Durbin AC and Mechanical

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A two speed unit can beat the North Texas cruel temperature.
Let's assume you have the average 3 ton house. Meaning that the
A/C load for your house is a 3 ton load. If you were to buy a 4 ton
two speed A/C unit, it will operate 75% of the time in low speed.
That would be equal to about 2 ton unit, but also capable of 4 ton
an extra one ton of air conditioning capability.

On the low temperature days you would be operating in low speed
at the 2 ton load, this will remove an excessive amount of relative
humidity. Also operating at less amperage than a normal 3 ton
unit. Number one saving you electric current, number two
controlling the humidity in your home. 75° at 35% relative humidity
feels a few degrees cooler than 75° at 70° relative humidity. This
makes you feel so much more comfortable at the lower humidity
setting.

If your house is properly insulated this little trick using a two
speed unit gives you the capability of beating that average 20°
differential that air-conditioning are designed for. The standards
for air-conditioning are normally 18° to 20° on average as a
differential temperature from outdoor ambient temperatures for a
standard air-conditioner. If you upsizing to a 4 ton two speed you
have an extra 33% above your load requirements. That extra 33%
should be able to allow you to maintain a 30° differential on those
brutal North Texas hot days.

The initial cost of a two speed unit is much higher than a standard
unit, but gives you a considerable amount of flexibility along with
energy savings 75% of the time. Being involved in air-conditioning
for over 45 years I don't know why someone didn't come up with
this sooner, including myself. This is sort of like having an air
conditioner with a supercharger on it. We all owe a vote of thanks
to the inventor of the two speed air-conditioning system.

TWO SPEED AIR CONDITIONING UNITS

This is the newest and best thing to hit the residential AC industry
in my 45+ of being involved in it.

WHY

Because two speed systems run in low-speed 75% of the time,
only costing you one half of the electric power 75% of the time.
This relates to about 40% off your cooling bill. Combine that with
higher efficiency furnace and the savings of another 15% in the
heating mode which is normal.

This is payback for new equipment in as little as 2 to 3 years, if energy
prices stay at their current rate. We both know that's not going to
happen, no energy costs are going down.

Wholesale air-conditioning equipment cost to AC dealers has increased
30 to 40% in the last three years, with government regulations to the
new 13 seer minimum. Manufacturers are again, talking about price
increases for 2009. High-efficiency air conditioning will never be lower
to purchase than right now.

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AC TWO SPEED UNITS