Keep the following lessons in mind when grabbing for your solder iron.

When things fit together, why do they sometimes leak?

Rule of thumb: If you can't find it in 15 minutes, it's junk.

Heat flows to cool, wherever you go.

You won't find anyone who knows what you do to be willing to answer phones for customer support.

Finding some answers to your frequently asked questions on aquastat relays.

When your customers shop retail, think of it as a lead to long-term service.

When something electrical doesn't work, it's so tempting to leap to difficult solutions.

Three-way switches - two switches controlling one light.

Recently I wrote about wiring wall outlets. This time I want to talk about wiring wall switches and light fixtures. If you've ever looked at an installed wall switch, you might see that there are two black wires attached to it, and no white. Or you might see a black and a white. Or there might be a black and a white with a black mark on it. Does it make a difference? And if so, what is the difference? Let's find out.