The Dons go into the game in eighth place in the Clydesdale Bank Premier League, a point behind their visitors. The Dons, who are out of the William Hill Scottish Cup, are looking to avoid a fourth consecutive season in the bottom six but they are only three points off a European slot and only four behind second-placed Inverness.
Langfield said on the club's official website: "It is such a tight league and we are only four points off second. Everyone keeps going on about how bad a season we have been having but a couple of wins could change things dramatically."
He added: "With the SPL as tight as it is, the game is massive. We have three crucial home games coming up and we need to start turning the draws we have been getting at home into wins.
"It will be a very difficult game against a side that come here on the back a fantastic result at the weekend against Motherwell. We know they are a difficult team to play against. They also have some very good footballers in the side who sometimes don't get the credit they deserve.
"Ivan Sproule is on form at the moment but all their midfielders are dangerous breaking forward."
County stretched their unbeaten run to eight games when they beat Motherwell 3-0 but manager Derek Adams expects his side to face an early onslaught.
Rory Fallon scored Aberdeen's goal inside seven minutes when they drew at Kilmarnock on Saturday and Niall McGinn hit their previous strike 18 minutes into their 1-0 home win over Dundee earlier this month.
Adams said: "Aberdeen are a team that start games very well. They play at a high tempo for the first 25 minutes and try to get a goal in that period of time. We are aware of that.
"They did that on Saturday against Kilmarnock and the many times I have seen them this season they have tried to do that."