hi marcus. yes, filters need to be changed often. in fact, i recommend at least once a month, depending on the location of your furnace and cold air return system. that being said, here is my experience and expertise. ( i just competed getting my certification in furnace repair). the purpose of the cold air and fan are to circulate the hot air to the area where heat is needed. but the purpose is also to cool the heat exchanger in the furnace as well. the heat exchanger is a sealed system of pipes that the heat created by the burners heats up. the air from the fan/ cold air return blows passed the heat exchanger to circulate the heat to other areas and to cool the heat exchanger. if the filter is clogged, no air gets past the heat exchanger and consequently, the heat exchanger will overheat and get damaged. i have personally seem the heat exchanger with massive holes in it due entirely to a clogged filter. it is highly unlikely that your heat exchanger inside is full of dirt, but the fan and area around the heat exchanger could be filthy

The city may claim to be bankrupt but it is a lot of money circulating within it right now.

That would get the air circulating and dry out any moisture.

.- There is no such thing as the "Congressional Reform Act of 2012" (previously referred to as the act of 2009, 2010, and 2011 -- it keeps getting updated each year in the email circulation).

The number of dollar bills in circulation is no longer a measure of anything but the number of trees we've recently killed, bleached, and slathered with green ink.

I am planning on circulating through my own network to see if I know any independent brokers, but if not I am likely going to have to turn to one of the bigger offices.

@Rob BelandThis is all I found:16) Delete sub-section 10.12.2 and replace it with the following:10.12.2 Prohibited AppliancesThe following equipment shall be prohibited:(a) gas range ovens, broilers, or top burners for space heating purposes;(b) gas ranges with match-lit ovens;(c) any commercial cooking range without a listed oven safety pilot; and(d) appliances not in compliance with the statutory requirements of M.G.L. c. 148, §25E.It came from here: http://www.mass.gov/ocabr/licensee/dpl-boards/pl/r...I have always believed the intent was to take these out of circulation when they fail, though I can't for the life of me find where it says they cannot be repaired. 

They replaced the breaker, the control panel, the circulator pump, a zone valve, bled the furnace and water heater.

The zoning is not really the issue, moreso ingress/egress, circulation, setbacks... some other requirements by code for building a building on a very small lot.

Before the show starts I circulate the other vendors and try to recruit them to send me anyone who mentions selling their property.