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Given the price of copper, I no longer use copper for plumbing but still stuck paying a really hi price for line sets. Is there a suitable non-copper product that can be used for line sets for R-22...

I had a similar situation. Turns out the leak wasn't near the meters at all. The line underground from the street had cracked. The gas was actually coming up from a drain near the meters.

The...

its really hard in my opinion, to attach a basement to a system thats supplying the rest of the house. Basements have such different load profiles, that you risk never having a balanced system.
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My HVAC guy (I handle the insulation end) quoted a system that caused the owner to have a heart attack. Owner's home is very large ranch style home: 3k sqft on the ground floor with a full finished...

Some here might find this interesting. It was forwarded to me. The govt. has been trying to incorporate efficiency standards for hi-velocity systems, that takes into account that they work a bit...

3% of what? 3% of the total heat load?

Crawl space heat losses depend on a number of factors. Biggest is how tightly sealed the space is. Older homes, in particular, get a lot of air leakage...

Using a two speed system is more for humidity control under low loads (cloudy, but very humid summer day). When you have two floors, generally the load profile are rather different for both. Its...

have you tried craiglist.org?

There are two main groups of ERV's

Passive - Doesn't have its own fan. It integrates with your existing forced air system

Active - has a dedicated fan

You also have other options such as a...

I do insulation installations in your area. I don't wan't to break a forum rule by giving you contact information here. I am doing a crawl space where I am turning it into a semi-conditioned space....

never mind.. I see someone just started a similar thread below...

I am in the process of designing a chilled water / Unico Hi-velocity system for a large suburban home. The home has very high late morning / early afternoon glazing loads, which then drop off later...

I am spec'd out a Unico Hi-velocity system. Most of the installers have gone back to metal ducts because Unico is putting waaaay too much of a markup on their rectangular fiberglass ducts. Round...

A common poblem I see are ducts in attics that are exposed. Ducts are minimally insulated and can lose upwards of 20% of their cooling load. Leaks are another problem. If the duct work was done in...

I didn't see any valves. The lineset was brazed right to the unit.. unless they were behind the panel.

There were two separate air handlers in differents parts of the house. I didn't open the units up to look to see if they were using only one TXV valve.

The owner said the system worked, except...

as the previous poster pointed out:

Systems are typically designed at an indoor temp of 75 F (78 F for Hi-velocity systems) with a swing of 3 F. During really hot weather, your house should hit...

I took a look at a house in western Long Island that was in need of insulation. While there, the owner pointed out his current HVAC system.

It consists of a single 3 ton condenser with two very...

I was using Armstrong for 1 ton condensers, but it appears they may have discontinued them. I know Trane makes ones that small. Do any other manufacturers as well? ANy using the newer R410a?

I...

Fenestration (light entering via windows, doors, skylites, etc), exposure, and insulation quality will have the greatest effects on the heating / cooling loads. Room size actually has very little to...

I should have done a search first.. the topic of my post has already been covered.

As an earlier poster pointed out, you might need more insulation. If the insulation in the attic is fiberglass, it would be a good idea to blow about 6 inches of cellulose on top. Fiberglass...

I in the process of specifying a Unico HV system for a large, residential home. I am in the process of try to evaluate if using a two speed system will be worth the extra cost / reduced reliability....

I am doing a cooling load anaylsis on a large home. The laundry room is attached to the kitchen. Dryer is gas and is vented to the outdoors.

I am trying to figure out a reasonable adder (on top...

I had a tennis ball get stuck in a roof drain (flat roof) during construction. Water was halfway up the parapets when it was discovered. Water was pouring down clear to the basement (wiping out all...