I know a minister who says they can detect and cleanse negative
energies from rooms. Are there any scientific studies from a reputable
source that prove that architecture retains positive or negative
energies from people/events residing in that room in the past and that
this energy can be changed? By a study from a "reputable source" I
mean an industry journal that is accepted by the scientific community.

The notion that people radiate some special sort of energy that can
permeate a room comes from the realm of supernatural studies, not from
the sciences.

Anyone who can provide scientifically acceptable evidence of such a
phenomenon can become rich very easily:

http://www.randi.org/research/index.html

NO.

currently there is no proof; validation; by "reputable"; i.e., Journal
of Science; Nature; etc... has yet to confirm or deny; therefore,
there is no bases; via scientific method of generating proof;
ovidence;

anecdotally...:) many have claimed; and there seem to be some truth to
the fact that some people could radiate 'radiation' in a sense that
they can generate heat source more so than average people; or thermal
energy greater than 'average' people;

furher its been long in use; claim; some people can indeed detect
negative or positive energy field;

in room, places; so forth... I believe such is matter of faith in such
area; metaphysics;

problem is current science could not absolutely disproof anything; 
since human has only evolved to the point they only use 5% of capacity
of its brain power;

who knows where human would be in couple of million years? if they
survive that long:)

Before one can really investigate these sorts of things, one needs to
actually define what is meant by "positive or negative energies", and
define them in a rigorous enough manner so that one can ask meaningful
questions about them. For example, how does one know if a room has neg
or pos energies? If you have a good way of testing that, then it is
easy to show if a particular practicioner can change neg to pos. In
fact, if you have a good way of testing that, then as mentioned
previously, you probably qualify for Randi's million dollars.

The idea that people only use a small percentage of their brain is a
myth. See http://faculty.washington.edu/chudler/tenper.html and the
links contained there. The brain uses an enormous fraction of our
energy, if people with smaller brains could get along with that
smaller brain, we would have all ended up with smaller brains long ago
in our history.

The idea that science cannot absolutely disprove anything may be true,
but it is relatively easy to prove or disprove specific statemes of
particular abilities. If someone claims that they can detect negative
energy, if you can get them to actually explain what they mean, then
it is fairly straightforward to devise a test (using double-blinds,
and other sorts of methods) that can confirm or refute their claim. So
far, no body has ever been able to confirm the effects of neg/pos
energies, and if/when they do, the million dollars is theirs.

To be clear, the answer to your question is "no". There are no
scientific studies from a reputable
source that prove that architecture retains positive or negative
energies from people/events residing in that room in the past.