Shekveva Adams - its just the metal expanding and contracting. It expands when heated and contracts when it cools and that is the sound you are hearing after you shut the oven off. I think in my Bluestar gas range/oven I hear it a loud boom about 15 minutes after I shut the oven off. I dont think you need to call anyone unless you want to pay them $100/hour to tell you that its thermodynamics.

My fan motor recently had an internal short to ground. The symptoms were the fan ran continuously at 1/2 spd and when the thermostat called for heat the motor would start to buzz, but no increase in airflow. I ordered an entire fan assembly w/ motor for under $400, I couldn't get the motor shaft out of the fan assembly without destroying the entire thing. Prior to replacing the fan assembly, I changed out the fan relay to no avail.

Nevada, NW of Reno, and something between 1350 and 1400 sq ft. - Checked and it is 1394 sq ft according to the realtor listing. It is a single story ranch on a slab. I am at something between 5000 and 5200 feet in altitude. I looked the furnace up on the Bryant website and it is 80% efficiency but I don't know which of the listed BTUs on the label should be used to determine the proper size of the furnace. The ceilings are insulated but the walls have little or no insulation to my knowledge. The calculator to which I was referred gives a result of approx 70k BTU. So if the highest listed BTUs on the label (88k) is the correct one to use for the size calculation, that results is 80% of 88k = 70,400 BTUs - so it would seem the furnace is properly sized. If that is NOT the correct value for BTUs, all the others listed on the label are less than that and the furnace must then be too small. We do normally get a lot of solar exposure here which may or may not enter into things. I have never set the heat higher than 68F and it is usually set to 60F at night and whenever I am gone. I'm on a fixed income so I watch those bills like a hawk and just wear more clothes. I did find a registry to look the business up as far as licensure, and it states he is licensed and the license is active. Keep in mind there is no AC so until it got quite cold here the furnace - or more correctly the blower - was not being used. I turned it on sometime in late Oct or early Nov. So before that there was no fan noise because the unit was not being used at all. The furnace is centrally located so that duct runs are shorter than usual. These houses were military housing for Air Force Brass and whatever else you could say about them, the floor plan and layout are quite efficient.

It could be because of the check valve that prevents the water flow back into the pump, and not sure what noise you hear but it's usualy you would hear banging noise caused by the pressure change in the pump and discharge hose when the pump turns back on it stops.