Without knowing the sq. ft. area of your house and what appliances you have connected and if your hot water tank is electric it is hard to make an assessment. The average household draws about 50 amps so if you are adding another 30 you will be getting close to the limit of the new panel. Ask for an estimate on the 100 amp panel and then on a 200 amp panel. The labor costs should not be much higher for the larger installation of a 200 amp panel just the materials.
A portable unit would be considered personal property. An installed unit becomes a part of the real property.
It means that it does not have an air conditioner or furnace installed. HVAC stands for "heating, ventilating, and cooling". HVAC is an integrated system that is not free standing, like a window air conditioner or heater.
Call an HVAC service man.
Call the Hvac company to check if you have a current warranty.Keep warranty information in a folder with the unit. This way you will know when to schedule service and what was done.
HVAC unit is basically combination of HVAC chiller and all related equipment. See below related link for all details
It depends on the type of HVAC unit you have. If it is an electric resistance system, then only once every five years or so. Gas and heat pump systems need to be serviced once every one or two years.
Removable GPS unis are convenient because they can be easily replaced if broken or if an upgrade is desired. Some people prefer the aesthetics and integration of an installed GPS unit, however.
ouside HVAC unit
Many times the hvac system needs a simple service upgrade if it does not work properly. Take the filter out and clean it, or replacing it would be even better. Check all of the wires to make sure none are frayed or need replaced. Then you should check the thermostat to be sure the temperature settings are the same before using the system. Get coolant in the hvac unit for summer, and have the heating coils checked for the winter.
A reputable HVAC service Co. will locate and repair the leak and recharge your system.
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Model # for Lennox HVAC unit