Monitor your filter changes more effectively by dating the filter whenever you replace it
The use of an existing well is a possibility but generally not conducive to a proper closed loop installation. The depth of the well and size of casing will be a consideration. Vertical loops are generally drilled by way of a 3' casing to a depth determined by the loop requirement. The well is then filled with a slurry to optimize heat transfer. The number of wells required is calculated as per the heating / cooling load of the home
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Well water pressure can be indicative of a number of issues but a simple check is to ensure your pressure tank is properly charged. The tank pressure should be 2PSI below your pump cut-in pressure setting. For example, if your pump cuts in at 30PSI, your tank should be charged at 28PSI, if it cuts in at 40PSI then it should be set at 38PSI. The pump cut-in pressure can be determined by running your water and watching your gauge (hence the importance of a good quality gauge). It should cut in and out in 20PSI intervals.
