Wire in house is alum I'm adding a light to a hunter fan and my line is copper on same fixture will their be any problems

In connecting copper to existing aluminum wiring you must take care to minimize the issues of corrosion that naturally occurs when two dissimialr metals are in contact. In electrical circuits this corrosion leads to higher resistance in the Al -Cu connection, which in turn leads to heat being generated when current flows, which in turn means incrased fire hazard. So be sure to (a )clean the existing aluminum conductors with a wire brush, (b) use an anti-oxidant compound such as NOALOX on the connection, and (c) use a special wire nut designed for AL- Cu connections. Alternatively - there are specially designed Al-Cu connectors for this specific issue - check out AlumiConn connectors: http://www.kinginnovation.com/products/electrical-products/alumiconn/

Are you saying that the fan is already installed and you are adding the light kit to the fan?
So you are not touching the aluminum wire?
Now, you are adding some more electrical "load" to an existing circuit with aluminum wire which can be an issue if you are now overloading the circuit... making that determination is difficult to do without being there...

How "old ",it may be tinned copper. Snip an end. Silver all the way through? Most fan wire is tinned, not aluminum.

You should be able to handle the load of the light kit, 60 watt is Usually Max, per light, LED and Fluorescent draw less?