Considering that you said this is a secondary house that you don't use, it's OK to do this but as long as you understand the risks involved. For example price could continue dropping (meaning you could lose money) for some time or price could stay here but in both cases it could take a very long time for price to go back up for you to start seeing any profit. Can you accept the fact that you may need to wait for a year or two to see profit?

Also you should educate yourself about storing bitcoins correctly in a cold storage so that you don't just lose all that money to a hack or malware or something like that!