Originally posted by @Jared Bryan:
A/C
unit - turns on but the fan doesn't turn. Might need a new capacitor or
motor. That and the furnace are both lennox and appear to be installed
in 2006.
Most of the outlets around the house are two pronged so
I hope you are correct about them being grounded. Changing to three
pronged outlets is easy as long the ground has been run. I didn't happen
to look for one in the bathroom, good call on that though.
A/C stuff:
You can shut off the power to the outside A/C
unit and open up the wiring compartment. The capacitor is usually a big
silver can, not quite as big as a Coke can, with wires on the top.
Normally, the top of it has a lip, and the top panel where the terminals
are sits flat, maybe 1/16" or 1/8" below the lip. If the top is all
puffed up, above the lip, then the capacitor is definitely bad.
If the capacitor looks OK, you can try something else... if you're careful. :) Find the contactor in the wiring compartment
that turns on the outside unit. It will have 240 V AC wires from the
house on one side, and 240 V AC wires to the compressor and fan motor on
the other. Often it has a plastic button on top that you can push to
close the contacts, even when the thermostat inside the house is not
calling for cool. By hand, spin the fan blades up as fast as you can.
TAKE YOUR HAND AWAY FROM THE FAN, and then push and hold the button on
the contactor. If the fan motor starts spinning the fan faster, then
the capacitor is bad. If the fan doesn't spin on its own, then probably
the fan motor is bad. Take your finger off the button when you're
done. (If you're not sure which way to spin the fan, try it both ways.)
If
you decide the capacitor is bad, take the old one to the friendly local
HVAC supply store and ask for another one. Grainger also has them, and
you probably shouldn't pay too much more than Grainger's "web price"
for it. You may be able to source the exact Lennox part (more money) or
use a generic fits-all (cheaper, might have to modify the bracket).
The microfarads (uF) should be the same as what you have now; the
voltage should be the same or higher (370 V and 440 V are the common
ratings).
If you decide you need a fan motor, check Grainger's
price, and compare against the local HVAC supply store. Again, there
will probably be an exact Lennox part for more money, and a generic for
cheaper. The generic might require you to crimp your own terminals on
the ends, or select from more wires than the Lennox part had - usually
there's a sticker on the new motor that will help you figure it out.
2006 is new enough that there might
be a circuit board in the outside unit, and sometimes those go bad. If
you can make the fan motor and compressor run by pushing the button,
you might disconnect the 24 V wires to the contactor from the circuit
board, and connect the 24 V wires from the indoor unit directly to the
contactor, bypassing the circuit board altogether. Once you do that, if
you can make the thermostat inside the house call for cool, and the
outside and inside units both come on, and you get cold air, then the
circuit board in the outside unit is bad. Once again, there are exact
parts, and (sometimes) generic parts.
If you don't feel
comfortable doing any or all of this, an HVAC tech knows how to do all
of it. Some of the cost of that knowledge will be subtracted from you.
:)
Outlets:
1970 seems really late to not have grounded
outlets, but I guess it's possible. (I think the electrical code on
this changed in the early 1960s, but not every city adopted the new code
right away.) You may find that the original kitchen and bathroom
outlets have grounds and nothing else does, because those outlets were
required to be grounded before the rest of the house was. Note that for
early grounded outlets, sometimes the ground wire was split out of the
cable outside of the box, and then wrapped around one of the
nails or screws that held the box to the stud. The receptacle gets
ground via its mounting strap being screwed to the box. (The kitchen
receptacles in my 1956 rental were done like this. The modern way is
to bring the ground wire into the box where you can see it.) So, if you
take the cover plate off and don't see a ground wire in there, that
doesn't mean it isn't grounded.
A simple check for grounds is to
use a 3-prong-to-2-prong adapter, and one of those 3-neon-lights outlet
testers. Remove the center screw, plug in the adapter, put the center
screw back (through the tab on the adapter), and plug the tester into
the adapter. If the two "good" lights come on and the "bad" light stays
off, then you have some kind of ground.
A better (IMHO) test is
to use an incandescent lamp in a socket with wires on it. Use a 100 W
lamp if you have one. Take the cover plate off, and then plug the wires
into the receptacle slots. The light will come on; notice how bright
it is. Now, unplug the wires. Touch one wire to the metal box, and
then try the other wire in both slots of the receptacle. Only one slot
should make it come on. It should be about as bright as you remember.
If it is, then you have a good ground at that box. If it's dimmer, or
flickery, then the ground connection is a little shaky.
If you don't have grounds at the 2-prong outlets, the deluxe way is just to rewire with new cable with ground. That's what I did on mine, and it rents for less than half of your "potential rental value". A probably-OK way is to install a GFCI outlet as the first outlet on each 2-prong outlet circuit; it's not quite as good as having a real ground, but it helps prevent some possible failures.
A 1970 house may not have been born with a dishwasher or Disposall. Sometimes those were added on to an existing circuit. (My house was that way when I got it; I'm pretty sure it would have popped breakers if you were running those appliances and then plugged in a clock radio in one of the bedrooms. :) ) If that's the case, you might think about splitting those out onto their own circuits.
@Don Meinke also raises many good points, in particular the FPE breaker box, lead paint, and outside receptacles.
You can do a simple test for lead paint yourself with some 3M "Lead Check" swabs from the hardware store. They look like a cigarette; you rub one end of them against the paint and the chemical in them turns colors if there's lead. You can also scrape up chips and send them out to be analyzed. Some home inspectors have an X-ray gun they can use on the paint to see if it's lead.
I added front and back outside receptacles to my rental. Mostly this was that so tenants wouldn't run extension cords through windows and doors... and partly it was so I could run my nuclear-powered lawn mower while I was doing rehab. :) In Minnesota, if people still have block heaters on their cars, that might be another use.