Your return air has no effect on the burner section of a furnace, every furnace has an induced motor for this.

Based on it being Lakefront, it’s most definitely more attractive and more marketable than not, albeit on a small “non motorized boat” lake.  

I currently work in the auto industry for Ford Motor Co.

Though, if the blower in your furnace is not a DC variable speed unit {i.e. an old single speed 75-100amp motor}, you should consider replacing the blower since it will be running year round and the blower tends to be the biggest energy consumer in older forced air systems.If the gas furnace is older (only 65 - 75% efficient vs 95% in a modern furnace), you could always replace it with a hybrid solution ... natural gas heat with an electric central air cooler.

But the damn motorized thing was so noisy I we stopped using it.

In-home businesses must be in accordance with city ordinances:"Prohibited Residential Occupations: No residential occupation shall involve the detailing, servicing, or repairing of motor vehicles".Certain types of businesses may be conducted in a unit (ie. tax preparing, accounting, typing services, data entry)The city ordinance also requires that a business license be obtained PRIOR to conducting the in-home business, and that a letter be required from the board of directors stating they are aware of the in-home business.

I’m getting the garage door and motor removed, and insulating this area.

The link you provided seems to have something to do with Motor Vehicles, I thought this was about housing.

http://bniajfi.org/vital_signs/This data is based on 2010-2015 and looking at changes from 2014-2015Washington Village /PigtownPopulation5th Lowest neighborhood Total Population5th lowest neighborhoodMale Population3rd lowest neighborhoodfemale populationTied for First Lowest neighborhood Population identifying their self as other race4th lowest neighborhood populating earning 24-40k a year2nd Highest affordability index for rent - tenants paying more than 30% of total household income3rd highest number of housing vouchers per 1000 rental units3rd highest mortality rate (death)3rd highest for Part 1 Crime ( Homicide, rape, robbery, assault, burglery larceny, auto theft4th highest for violent Crime3rd highest for property crime2nd highest for rate of adult arrests1st highest for rate of domestic violence2nd highest for rate of common assault2nd highest for rate of narcotics related calls2nd highest of rate for motor vehicle accident calls3rd highest for jevenile arrest rate3rd highest for residents that work outside of Baltimore 5th highest for reports of dirty streets2nd highest for reports of clogged storm drains

Mobile will be handled by department of motor vehicles.