This is a short name for "heat loss and gain calculation". This is something that every HVAC contractor should do at the very beginning of every job, but in reality there are very few that will even mention it to you, and if you even ask them about it, they will try to convince you that it is either very expensive or completely unnecessary because there's a "rule of thumb", or press you with their alleged experience and tell you how many thousands of people they have made happy.

I have an obsolete 34 ton Carrier, rooftop, multi-zone, direct expansion unit that I virtually can't get replacement parts for. I need a comparable change out, preferably not a Carrier. Can someone recommend a good substitute, brand, and model number? Also, I have the same scenario with a 20 ton Carrier. We recently bought another home and moved. This home has two dual fuel heat pumps that are zoned. Can you explain exactly how dual fuel heat pumps work.

The fans are installed redundantly, i.e. one alone or two are sufficient to operate the system at full capacity. Only the internal rack temperature rises insignificantly here (a few degrees).

Heat stroke is the most serious heat-related illness. It occurs when the body becomes unable to control its temperature: the body’s temperature rises rapidly, the sweating mechanism fails, and the body is unable to cool down. Body temperature may rise to 106°F or higher within 10 to 15 minutes. Heat stroke can cause death or permanent disability if emergency treatment is not provided.

There is an excellent wood stove with a not-so-excellent chimney. The problem was that the chimney had a good sized crack in it, which we repaired with aluminum foil! The wood supply is excellent too—lots of driftwood. Another problem is that a million wasps come out inside the house as soon as you light the stove and warm the house a bit.

The load can be anything you like. We hope you will be creative and make this event fun by having creative loads to carry. You might represent your country or your state or your sponsor or your favorite food or cartoon character in what you decide to carry with your lift. The important thing is that it is artistic and fun!

Yes. Any entrees that have been stored for you in your freezer should be defrosted overnight in your refrigerator then heated, to be enjoyed at the peak of their flavor. I'll always leave you with easy to-follow heating instructions for each entree.

Yes, lice hate dry heat. You can put clothes, hats, towels, etc in a hot dryer for twenty minutes which should kill lice and their eggs.

Heat stress occurs when the body's reaction to the environment causes its core temperature to rise above safe limits. This can result in a racing heart, profuse sweating, dizziness, reduced energy and slowed reaction times. This reduces safety, decreases efficiency and lowers productivity.

The greenhouses can be heated with propane, natural gas or electric greenhouse heaters with thermostatic controls. In mild conditions, 5-gallon covered black buckets filled with water will trap the solar energy during the day and release heat for most of the night. Another option is adding rabbits to your greenhouse. Rabbits put out 8 BTU’s per hour which amounts to roughly 2.5 gal of fuel in 6 months. Rabbit manure also adds heat and makes a great non-burning fertilizer.

Many chemical and nuclear processes are "exothermic," meaning they produce more energy out than is input. For example, when you strike a match, it burns until the fuel is exhausted, producing energy-small energy in (from the striking motion), large energy out. Some LENR devices produce energy the way a burning match does: no energy is input after an initiation trigger, but a steady stream of heat is produced.