If the basement has ventilation to outside, the answer is yes. Heat loss from the pipes will escape outside the house.
If the basement is closed to the outside then no, the pipes need not be insulated. Any heat lost from the pipes will provide some heating to the basement that will rise into the house.
You should not have air in your pipes. Call a plumber.
Three common types of heating systems are forced air, radiant heat, and hydronic heating. Forced air systems use a furnace to heat air and distribute it through ducts. Radiant heating involves warming surfaces, such as floors or walls, which then radiate heat into the room. Hydronic heating uses hot water circulated through pipes to provide warmth, often in baseboard heaters or radiant floor systems.
Additional shut off valve, below sink or in basement. Incomplete pipes not tied into bathroom sink line.
Should be the same, when your home was originally built, it was pressure tested (without water). This assures that there is no leaks in the entire home, if the plumber knew what he/she was doing they designed the system to have the larger dimension pipes closer to the water meter and if designed correctly the furthest pipes from the water meter are the smallest dimension pipes in the house. This assures that when valves are opened in different parts of the house there is a greater likelihood of a maintained service pressure. Of course if you open a downstairs faucet (say a kitchen sink) and are doing laundry (in the basement) and then try to take a shower in an upstairs bathroom you will notice a drop in pressure.
Insulating your copper pipes is a great idea. Insulating with foam will insure less heat loss which save energy and probably take a few bucks off your electricity bill.
Do you have problems with frozen pipes? Does someone live in the basement? You won't lose much heat through the basement because heat rises.
a hydronic system
I see no reason why you would insulate them. When you close your pool for winter you will purge (empty) your pump and pipes. The water in the pool would freeze long before the water will in the pipes under ground.
28 degrees above zero (Fahrenheit) for more than 4 hours will freeze your pipes, so insulate, insulate, insulate.
to insulate and/or reinforce
A boiler with a circulating pump and pipes to convey heating water around a house, through radiators or underfloor pipes.
To prevent frozen pipes from bursting, you should thaw them slowly using a hairdryer or heating pad. Do not use open flames. Insulate pipes and keep faucets dripping to prevent freezing.
It's colder in the basement than the water coming in the pipes. Seal up the vents and drafts in the basement. Wrap the pipes
To prevent pipes from bursting during freezing temperatures, you should insulate exposed pipes, keep a consistent temperature in your home, allow faucets to drip, and open cabinet doors to allow warm air to circulate around pipes.
Yes, the leaking pipes in the basement are causing damage and require immediate attention.
With rubber or circular foam that you can by from any hardware store
The pipes are gurgling in the basement because there may be air trapped in the pipes, causing the water to flow unevenly and create the gurgling sound. This can be a sign of a plumbing issue that may need to be addressed by a professional.