http://www.househacker.com/ househacker/tags/hvac
Via Fepy.com]]> http://www.househacker.com/permanent/Consumer-Reports-Air-Conditioner-Power-Calculator
Here's the basic setup. The garbage can is filled with ice water, which is then fed by gravity (a siphon) through the copper tubing coiled along the back of the fan. The hot air passing through the tubing warms the cold water, cooling the air. Waste warm water is then pumped outside. The system will cool an average room to a comfortable level in approximately 15-20 minutes. Depending on flow rate, a full bucket of water will last approximately 1-3 hours. I use a single bucket before bed on hot nights, which lets me get to sleep. Once the water runs out, the house has cooled off enough that the fan alone provides sufficient cooling.

Recently, someone has posted instructions for making improvements to the homemade air conditioner, which involves an aquarium pump to recycle the water, which in the first generation model, was routed outside the house.

Via LifeHacker]]> http://www.househacker.com/permanent/Sub-Thirty-Dollar-Homemade-Air-Conditioner
The home is connected to the power grid, but attempts to satisfy as much of it's own energy requirements through alternative, renewable methods as well as utilizing high efficiency construction techniques, resulting in net zero energy consumption for the year.

From the site:

"Zero energy homes get a black eye in my mind," says McKown, "Every time they do a demonstration site, they run out and they hire some brilliant architect and they go off and they build this one-off amazing house that sticks out of the neighborhood like a prairie chicken, and it costs a million dollars. Everybody looks at that and says, 'That's interesting. With enough money, you can do anything.' "We wanted to show that you can take any house out of a builder's product line," McKown continues, "and make it a zero energy house and it would look and feel and be just like a regular house, and it doesn't have to cost a million dollars. We could do it under $200,000."

The home made use of some interesting energy saving technology, such as:

• Tankless water heaters
• Ground source heat pumps
• South facing solar panels
• Low-e vinyl windows
• Fresh Air HVAC system

The home isn't currently one of the models that Ideal Homes sells. The company says that as people toured the home, they were more interested in the energy saving technology found in the home and using it to achieve super high efficiency, rather than actually having a home be zero energy, oddly.]]> http://www.househacker.com/permanent/First-Affordable-Zero-Energy-Home-in-the-US
Proliphix offers indoor temperature sensors, which can be mounted away from the thermostat so that temperature inside a home or small business can be averaged across multiple rooms to avoid hot or cold spots and wasted energy. With an optional Proliphix outdoor temperature sensor connected to a networked thermostat, the heating/cooling system can be controlled more precisely to efficiently and more comfortably overcome the indoor to outdoor temperature difference. The web browser configuration tool is simple to use and allows users to easily configure heating or cooling programs to maximize comfort and minimize energy use.

Smarthome sells the Proliphix NT20e, which is the same unit but with 2 additional remote temperature sensors, for use in monitoring different zones within your home or even the outdoor temperature.]]> http://www.househacker.com/permanent/Internet-Controllable-Thermostat Tamarack Technologies claims to be able to reduce the cost of home air conditioning by as much as 30%, all on the energy it takes to run two 60W light bulbs. From the site:

Engineered to reduce indoor air temperature, the HV pushes the hot air out of the house through the attic and replaces it with cooler outside air. The HV utilizes twin, high-tech, super efficient fan motors to minimize noise and power consumption. Our systems have the industry's only automatic door assembly, providing an air-tight seal with an insulating value of R-22.

The unit operates by remote control to boot.]]> http://www.househacker.com/permanent/Whole-House-Cooling-Fan save energy, you may have experienced this upon coming home early or off schedule. Avoid such a predicament with a telephone controllable thermostat that allows you to call home and chat with your heating system, giving you time to work things out. Talkingthermostats.com offers this device, of which you can hear a sample of here. ]]> http://www.househacker.com/permanent/Telephone-Controlled-Thermostat